PHONONS 89 - GBV · Polyacetylene 100 L. Brombacher, A. Hagemeyer and G. Wegner Investigation of...
Transcript of PHONONS 89 - GBV · Polyacetylene 100 L. Brombacher, A. Hagemeyer and G. Wegner Investigation of...
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PHONONS 89
Heidelberg, 21-25 August 1989Federal Republic of Germany
Proceedings of theThird International Conference on
Phonon Physicsand the
Sixth International Conference onPhonon Scattering
in Condensed Matter
Volume 1
Editors
S Hunklinger W Ludwig G Weiss
UNIVERSITATSEiBLIOTHEK^HANNOVER
TECHNiSCHEi INFORMATiONSB.BLiOTHEK ,
World ScientificSingapore • New Jersey • London • Hong Kong
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UNIVERSITA7SBIBLI0THEKHANN0V7.R
TECHNJSCHEINFORM AT.ONSBiBLIOTHEK
VII
CONTENT
32Preface
VOLUME 1
Introductory Remarks: 77 Years of Lattice Dynamics 1
W. Ludwig
Chapter 1: Phonon Dispersion: Theory and Experiments 5
Inelastic Neutron Scattering in Molecular Crystals 7S.F. Trevino
Anharmonic Processes in Molecular Crystals 17B. Perrin
Microscopic Theory of Bulk Phonons in Crystals 27C. Falter
Phonon Dispersion Sheets and Group Velocities in GaAs 37B. Dorner and D. Strauch
Lattice Dynamics of Tin 40A.S. Ivanov, A. Yu. Rumiantsev, N.L. Mitrofanov,B. Dorner and V. V. Pushkarev
Phonon Dispersion in a Deuterated 2,3-DimethylnaphtaleneCrystal at 123 K 43
V.K. Jindal, J. Kalus, U. Scnmelzer, F. Worlen and G. Eckold
First Principles Investigations of Anomalous Phonon Propertiesof Copper Halides 46
J. W. Kremer and K.H. Weyrich
EXAFS Debye-Waller Factors of Agl: Correlation withPhonon Spectra 49
G. Dalba, P. Fornasini, F. Rocca and W. Biihrer
Phonon Frequencies of Copper 52K.K. Chopra and D. Kitous
Phonon Dispersion of the Shape Memory Alloy NiTi 55G. Herget, M. Mullner, G. Eckold and H. Jex
Phonon Density of States of NiTi 58G. Herget, M. Mullner, J.B. Suck, R. Schmidt and H. Wipf
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Phonon Dispersion in Cu-Zn (31 at .%) — "Kohn"-Anomalies and"Short-Range Order Effects 61
W. Buhrer, L. Reinhard, B. Schonfeld and G. Kostorz
Lattice Dynamics and Electro** Phonon Coupling in Copper-BasedAlloys 64
A.S. Ivanov, N.L. Mitrofanov, A.Yu. Rumyantsev,V.A. Udovenko, L. Weiss, H. Eschrig and R. Richter
Lattice Dynamics of Intermediate Valence Semiconductor SmB6 67P.A. Alekseev, A.S. Ivanov, B. Dorner, H. Schober,K.A. Kikoin, E.S. Konovalova, A.S. Mishchenko, V.N. Lazukov,Yu.B. Paderno, A.Yu. Rumyantsev and I.P. Sadikov
Lattice Constant Dependence of the Phonon Spectra ofTransition Metals 70
K. Schwartzman and P.C. Pattnaik
Direct-Space Lattice Dynamics in Metals 73A.K. Sarkar
Phonons in a-Quartz 76B. Dorner, D. Strauch, H. Schober and K. Nutzel
Wavevector Dependence of Phonon Eigenvectors in Si 79D. Strauch, A.P. Mayer and B. Dorner
Phonons in AlSb 82D. Strauch, B. Dorner and K. Karch
Phonon Life Time Spectral Distribution for p-Hydrogen andNaphthalene Crystals 85
E. Sheka, Yu. Shitikov and B. Vindrjayevski
Phonon Modes Investigation with FIR Reflectivity Measurementson One Dimensional Pt-Halogen Chains 88
L. Degiorgi, M. Haruki, P. Wachter and S. Kurita
Far-IR Study of Molecular Beam Deposited Films of theSystem In-Se 91
/. Lelidis, D. Siapkas, J. Emery, C. Julien and M. Balkanski
Light Absorption by Insulating Crystal Films 94K. Arabajian, A.S. Barinov and E.A. Vinogradov
FIR Investigations of Mixed Valence 3d Transition-Metal Oxide(Fe3O4 and Ti4O7) 97
L. Degiorgi, P. Wachter and G. Schlenker
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Normal Coordinate Analysis of Model Compounds for Oxidized „Polyacetylene 100
L. Brombacher, A. Hagemeyer and G. Wegner
Investigation of Optical Phonons in AgGaSe2 103J. Camassel, L. Artus, J. Pujol and J. Pascual
Long Wavelength Optical Phonons in ZnTei-x-ySe^SyQuaternary Alloy 106
E.G. Gupta, J. Malhotra and B.B. Tripathi
Interpretation of Optical Peaks in Terms of Critical PointPhonons in Zinc Blende Semiconductors 109
S.S. Kushwaha, S.P. Singh and M.P. Hemkar
Dynamics and Infrared Absorption of Interstitial Oxygenin Silicon 112
W. Kress and S.P. Sanyal
Many-Phonons Absorption of Light in Nonpolar Crystals 115F. V. Kusmartsev
On the Studies of Low-Frequency Excitations in Pigment-ProteinComplexes of Plants by Using Optical Hole-Burning Spectroscopy 118
R. Vladkova
Light Scattering in Thin Films 121E.A. Vinogradov, V.V. Kovalevskii, N.N. Mel'nik andO.A. Turok
Growth Profile Characterization of GaAs Epitaxy on a SiSubstrate. A Micro Raman Study 124
J. Sapriel, J. Chavignon, R. Azoulay, N. Draidia,Y. Gao and H. Boyer
Structure Characterization of CVD and PVD Carbon Films byRaman and IR Spectroscopy 127
M. Wakaki and N. Okuyama
Relations Between Hyper-Rayleigh and Soft-Mode Hyper-RamanScattering in the Incipient Ferroelectric KTaO3 130
H. Vogt
Temperature Behaviour of Low-Frequency Raman Scatteringfrom Lead /3"-Alumina Crystals 133
G. Mariotto, E. Gazzanelli and A. Wague
Raman Study of AlSb 136Y.S. Raptis and E. Anastassakis
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Brillouin Scattering in Monoclinic Lithium Sulfate „ 139E. Gazzanelli, A. Fontana and L. Gratton
Phonons in Biology: Brillouin Scattering from Muscle 142N. Berovic, N. Thomas, R.A. Thornhill and J.M. Vaugkan
On Phonon Softening in a Quantum Ferroelectric 145P. Konsin, N. Kristoffel and T. Ord
Inelastic Neutron Scattering from Low Temperature Phases of/9-LiNH4SO4 (LAS) 148
/. Sosnowska, J. Sosnowski and M. Prager
Isotope Effect on NaCl Transverse Optical Phonon Force Constant 151T. Hidaka
Phonon Spectrum of Nickel with Bulk Defect and HighArea Surface 154
P. Nechitaylov, E. Sheka and Yu. Shitikov
Neutron Vibrational Spectroscopy on /9-Tio.84Vo.i6Ho.6i 157I.O. Bashkin, A.I. Kolesnikov, V.Yu. MalyshevE.G. Ponyatovskii, V.K. Fedotov, J. Maier and I. Natkaniec
Resonant Raman Spectra and Photoluminescence in Polythiophene 160J.L. Sauvajol, D. Ghenouni, C. Chorro, B. Moukala andJ.P. Lere-porte
Dynamics of Polythiophene (Perfect and with Defects) —Spectral Moments Method 163
G. Poussigue and C. Benoit
Magnetic Effects in the Elastic Constant C'of bcc Fe(Si) 166J.M. Alves and A.M. Vallera
Phonon Excitations in Heisenberg Magnets 169T.J. Drye and J. W. Tucker
Effect of Energy Bands on Transverse Magnetoresistance inDegenerate n-Type Indium Antimonide 172
C.-C. Wu and J. Tsai
Physical Nature of Phonons and Photons and their Role inConduction and Superconductivity 175
M. Simhony
Phonon Eigenvectors in Shell-Model Description of CubicSilicon Carbide 178
C. Cheng and K. Kunc
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Anharmonic Model for Lattice Dynamics in Silicon " 181M.T. Labrot, A.P. Mayer and R.K. Wehner
Reflectivity Spectra of AlaGai_a;As Homogeneous and ModulatedAlloys by a Bond Charge Model, Average T-Matrix Calculation 184
M. Bernasconi, L. Miglio, L. Colombo and G. Benedek
A Bond-Charge Model for the Pseudoatom in Germanium 187M.A. Ball
A New Model for Lattice Dynamics of Noble Metals 190M.M. Shukla, B. Laks and J. Mahanty
A Selfconsistent Calculation of Phonon Frequencies, ChargeDensity and Electronic Bandstructure of Si 193
H. Rakel, M. Klenner, C. Falter and W. Ludwig
Calculation of Electron-Phonon Matrix Elements in Siliconwithin the Partial Density Model 196
M. Klenner, H. Rakel, C. Falter and W. Ludwig
Can Reliable Information be Got from Experimental Phonon Data? 1995. Hajaij and M.A. Ball
Phonons in Substitutional fee Cobalt-Nickel Alloys 202B. Laks, M. Imaizumi and M.M. Shukla
The Macroscopic Polarization of a Zone-Center Transverse Mode 205P. Giannozzi, S.de Gironcoli and R. Resta
Absolute Deformation Potentials in Semiconductors 208R. Resta, L. Colombo and S. Baroni
Lifetimes and Frequency Shifts of Phonons in Si 211S. Narasimhan and D. Vanderbilt
Chapter 2: Phonons in High-Tc Superconductors 215
Lattice Dynamics and Electron-Phonon Coupling in High-TcSuperconductors 217
L. Pintschovius
Phonon Transport in High-Tc Superconductors 227P. Berberich
Low Frequency Excitation Spectra of High Tc Superconductors 237A.J. Sievers, T.W. Noh and S.G. Kaplan
Raman Scattering in High-Tc Superconductors 247C. Thomsen
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Lattice Dynamics of the Tl-based Superconductors: »Raman and IR Active Modes 256
A.D. Kulkarni, F. W. de Wette, J. Prade,U. Schroder and W. Kress
Ferromagnetic Clustering and High-Tc Superconductivity 259V. Hizhnyakov and E. Sigmund
Two-Phonon Coherent State in Superconducting Polaron Systems 262H. Zheng
Possible Interplay of Intrinsic Doping and LatticeAnharmonicity in HTSC's 265
H. Eschrig and S.-L. Drechsler
Electron-Phonon Interaction and Superconductivity inBa^Ki-jBiOa 268
M. Shirai, N. Suzuki and K. Motizuki
Lattice Dynamical and Quantum-Mechanical Investigationof the Ferroelectric and Superconducting Properties ofBaPbx-sBisOa 271
H. Buttner, A. Bussmann-Holder, A. Simon and V. Waas
Phonons in High-Tc Superconductors 274H.C. Gupta
Pseudo Jahn-Teller Pairing Mechanism in Cuprate Superconductors 277B. Halperin, R. Englman and M. Weger
Phonon Induced Superexchange and Superconductivity of Diholonsand Didublouns in HTSC 280
A.N. Kocharian and P.S. Ovnanian
High-Tc Superconductivity induced by Interband Interaction 283P. Konsin, N. Kristoffel and T. 3rd
About Mechanism of High-Temperature Superconductivity 286F.V. Kusrriartsev, V.I. Levashev and F.D. Senchukov
On the Role of Breathing Phonon in High-Tc Superconductors 289E. Matsushita
Percolation Induced Conductivity in High-Tc SuperconductingMaterials 292
V. Hizhnyakov, N. Kristoffel and E. Sigmund
Pairing Mechanism Driven by a Deformational Coupling withOptical Phonons 295
M. Schneider, E. Sigmund and V. Hizhnyakov
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A Model of Phonon Mediated High-Tc Superconductivity - 298T. Sota and K. Suzuki
The Electron-Phonon Interaction in Lai.85Sr0.i5CuO4 301M. Nakatani, T. Sota and K. Suzuki
Isotopic Effect for Tc and Soft Anharmonic Modes 304A.P. Zhernov
High-Frequency Phonon Hardening in Doped YBa2Cu307 andBi2Sr2(Cai_IYI)Cu2O8 as Tc Decreases: An InelasticNeutron Scattering Study 307
F. Gompf, B. Renker, P. Adelmann, D. Ewert,E. Gering and H.Mutka
Experimental Investigation of the Partial Density of Cu AtomsVibrational States for YBa2Cu3O7_y 310
P.P. Parshin, M.G. Zemlyanov, O.E. Parphenovand A.A. Chernyshev
Phonon Intensity Anomalies near 235 K in YBa2Cu3O7_;,;Superconductors: Reconciliation of the Results of Zhang et al.and of Rebane et al. 313
J.F. Scott and Zhang Ming-sheng
Thermal Conductivity of High-Tc Ceramics 316V.B. Efimov, A.A. Levchenko, L.P. Mezhov-Deglin,R.K. Nikolaev, N.S. Sidorov and I.E. Schtinov
Two Level Tunneling Systems as a Probe of Electrons and Phononsin the High Tc Superconductor YBa2Cu307_d and in Niobium 319
C. Elbaum, M.J. McKenna, A. Hikata, R. Kershaw andA. Wold
Ultrasonic Studies of Two Level Systems and their Relationto Oxygen Content and Tc in YBa2Cu307_« 322
A. Hikata, M.J. McKenna, C. Elbaum, R. Kershaw andA. Wold
Glassy Behaviour of Low Temperature Energy Relaxation inYBa2Cu307 and YBa2Cu306 325
A. Sahling and S. Sahling
Fabrication of Thin-Film High-Tc Superconductors:Application as a Phonon Detector 328
M. Obry, J. Tate, P. Berberich and H. Kinder
FIR Study of the YBa2Cu306 Phonon Anisotropies 331I.B. Ferreira, M. Bauer, L. Genzel, P. Murugaraj and J. Maier
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Theory of Interband Raman Scattering in.YBa2Cu3O7:a Probe of Unconventional Superconductivity 334 j
H. Monien and A. Zawadowski
Raman Scattering on all of Possible Phonon Modes in High-TcYBa2Cu307_a; 337
S.L. Zhang, Y. Jin, Z.-A. Guo, G.-C. Xiong, S.-Z. Wang
Optical Phonons in Superconductor Bi2Sr2CaCu2O8+x:Polarized Raman Spectra and Complete Theoretical Analysis ofOrthorhombic Structures 340
A.A. Bush, I.V. Gladishev, A.A. Golub, M.F. Limonov,Yu.F. Markov, O. Yu. Mashtakov, V. Yu. Mirovitskii,G.V. Mikhailov and A.G. Panfilov
Anomalous Angular Dependence of the Ag-Phonon Intensities andSoft Mode in the La2-aSraCuO4 Crystals 343
V.N. Denisov, A.F. Goncharov, B.N. Mavrin,V.B. Podobedov
Resonant Raman Scattering in High Tc Superconductors 346E.T. Heyen, R. Liu, B. Gegenheimer, C. Thomsen, <M. Cardona, S. Pinol and D. MckPaul
Raman Active Phonons in the High-Tc Superconductors: iA Global Point of View 349
G. Burns, M.K. Crawford, F.H. Dacol, N. Herron and jF. Holtzberg '•
Far Infrared Spectroscopy of Phonons in High Tc Superconductors 352 ;M.K. Crawford, G. Burns, E.M. McCarron, W.E. Farneth,F. Holtzberg and N. Herron I
Characterization of the Bidimensionality of Electronic ,Properties in High-Tc Superconductors by Infrared ;Reflectivity Spectfoscopy 355 ij
F. Gervais, P. Echegut, J.M. Bassat, M. Gervais, ['K. Dembinski and P. Odier J
Temperature Dependent Far Infrared Studies of Magnetically- ?Oriented YBa2Cu307_« 358 ,̂
C.H. Perry, F. Lu, K. Chen and R.S. Markiewicz \
Evidence of Free Carrier Localization in the Phonon Spectra ofYBa2Cu30a! 361
V.M. Burlakov, K.V. Kraiskaya, A.G. Mitko, iE.A. Firsov and V.A. Yakovlev
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Chapter 3: Phonons and Low-Energy Excitations JnAmorphous Solids 365
Vibration and Relaxation in Glasses 367W.A. Phillips
Extensions of the Tunneling Model 375D.A. Par shin
Low-Frequency Vibrational Spectra of Amorphous Solids 387W.A. Kamitakahara
Atomic Dynamics of Icosahedral Alloys 397J.-B. Suck
Glasses and Crystalline Defect Systems at Low Temperatures:Dielectric Experiments 407
M.v. Schickfus, G. Baier and C. Enss
Low Lying Instability of a Distorted Octahedron: Model forTunneling in Glasses 417
H.R. Schober, U. Buchenau
Correlation Time Measurement of the Pseudo-MagnetizationFluctuations in an Amorphous Compound 420
M. Devaud, J.-Y. Prieur
Acoustic Experiments at Ultralow Temperatures on AmorphousPdSiCu 423
P. Esquinazi, R. Konig, F. Pobell, F. Dietzel,G. Weiss, S. Hunklinger
The Phonon — Phonon Interaction Induced by Two LevelSystems in Glasses 426
V.S. Lutovinov
Specific Heat of Rare-Gas Films at Low Temperatures 429H. Menges, R. Rapp, N. Steinmetz, A. Goldacker andH.v. Lohneysen
An Interacting Defect Model of Amorphous Materials 432Glare C. Yu and A.J. Leggett
Low-Temperature Specific Heat of Glasses: Quantum Monte CarloSimulation of a Strongly Anharmonic Oscillator 435
J. Michalski and P. Erdos
A Librational Mesoscopic Soft Mode Model of Glasses 438M. Wagner and Th. Mougios
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I
Simple Microscopic Models for Disordered Structures: •»
Two Level Systems and Specific Heat 441 |
R. Schilling |
Vibrat ional States and Tunneling in Irradiated Crystals I
and in Glasses 444
H.R. Schober
High Resolution Brillouin Scattering from Vitreous Silica
at High Pressures and Low Temperatures 447 I
D. Tielburger, R. Merz and S. Hunklinger *
Anharmonicity Versus Thermally Activated Structural Relaxation
in Crystalline, Amorphous and Irradiated SiO2 450
J.P. Bonnet, A.A. Gherbi, M. Boissier, R. Vacher, \
J. Pelous, A. Vanelstraete and C. Laermans
The Theory of Low Temperature Electric Dipole Echo f
in Glasses 453 t
V.L. Gurevich, M.I. Muradov and D.A. Parshin I
Nonlinear Low-Temperature Absorption of Ultrasound and \
Electromagnetic Waves in Glasses 456 I
Yu.M. Galperin, D.A. Parshin and V.N. Solovyev J
Monte-Carlo Simulation of Spectral Diffusion in Glasses: *
Nonlinear Resonant Attenuation and Hole Burning 459 ;
D.A. Parshin and V.N.Solovyev f.
Numerical Simulation of Echo Phenomena in Dielectric
Glasses 462
D.A. Parshin, A.S. Polhovskii and V.N. Solovyev
The Nonlinear Regime of Sound Damping Due to Relaxational
Absorption in Glasses 465
V. Lutovinov
Low Temperature Heat Release in Glasses 468M. Deye and P. Esquinazi
Low-Temperature Elastic Properties of Amorphous
(Moi-sRu^o.sPo^ 471F. Lichtenberg, H. Raad, W. Morr and G. Weiss
Dynamics of Tunneling States in Borosilicate Glass 474C. Enss, C. Bechinger and M.v. Schickfus
Density of Tunneling States in Electrolyte Glasses 477V. Rohring, K. Runge and G. Kasper
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Evolution of Solid State Amorphization during Mechanical •»
Alloying of PdSiCu 480
M.J. McKenna, A. Hikata and C. Elbaum
Acoustic Measurements of Quench-Condensed Ar-Xe-Mixtures 483
L. Hornig, B. Dottling, G. Weiss, S. Hunklinger and
F.Baumann
Structure and Specific Heat of Quench-Condensed Rare-Gas
Mixtures 486
R. Dorwarth, J. Hasse, H. Menges and H.v. Lohneysen
The Low-Temperature Ultrasonic Attenuation and the PhononMechanisms in Neutron Irradiated Quartz 489
V. Esteves, C. Laermans
Precision Ultrasonic Velocity Measurements in NeutronIrradiated Quartz Upon Heat-Treatment 492
C. Laermans, A. Vanelstraete
High Frequency Phonon Transmission Through Amorphous Films 495J. Mebert, B. Maile, W. Eisenmenger
Picosecond Optics Measurement of Attenuation of HighFrequency Phonons in a-SiO2 498
C.-D. Zhu, H.J. Maris and J. Tauc
Lattice Vibrations in Glasses at High Temperatures 501D.G. Cahill, S.K. Watson, R.O. Pohl
Elementary Structure Rearrangements at Boundaries in aPolycluster Amorphous Solid and their Contribution toInternal Friction 504
A.S. Bakaj and N.P. Lazarev
Thermal Conduction Threshold in Binary ChalcogenideGlasses 507
J. Philip, K.N. Madhusoodanan, E.S.R. Gopal and S.Asokan
Temperature Dependence of Thermal Diffusivity in Ge-Se andAs-Se Glasses 510
K.N. Madhusoodanan and J. Philip
Is the Thermal Conductivity of Undercooled Melts Near theGlass Transition (and of Glasses) Frequency Dependent? 513
J. Jackie
Low Temperature Long-Time Energy Relaxation in LiCl*7H2O 516S. Sahling
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Anelastic Relaxations in Rare Earth Phosphate Glasses v 519G. Carini, M. Cutroni, G. D'Angelo, M. Federico,G. Galli, G.A. Saunders and G. Tripodo
Vibrational Decoupling of the Symmetric Ring Mode inVitreous B2O3 522
M.A. Kanehisa and R.J. Elliott
Unusual Temperature Dependence of Nuclear Spin Relaxationin Fluoride Glasses at Low Temperatures 525
S. Estalji, O. Kanert, J. Steinert,G. Balzer-Jollenbeck and H. Jain
Universal Form of the Low-Energy Vibrational Spectrumof Glasses 528
V.K. Malinovsky, V.N. Novikov, P.P. ParshinA.P. Sokolov and M.G.Zemlyanov
Effective Medium Theory for Phonons Glasses: The MeanFree Path 531
W. Schirmacher and M. Wagener
The Soft Mode Concept as a Link Between Entropy of Liquidsand Tunneling States in Glasses 534
U. Buchenau
Neutron Scattering Determination of the Vibrational Spectraof Amorphous and Crystalline H2O Ice 537
E.C. Svensson, V.F. Sears, J.H. Root, C. Szornel,D.D. Klug, E. Whalley and E.D. Hallman
Inelastic Neutron Scattering Study of a Ternary TransitionMetal-Metalloid Glass 540
R. Caciuffo, O. Francescangeli, S. Melon, E. Gering,J.-B. Suck, M. Bonnet
Experimental Observation of Soft Anharmonic Modes inZr67Cu33 Metallic Glass 543
G.F. Syrykh and A.P. Zhernov
Multiphonon Absorption and the Phonon Sideband in theAbsorption of Hydroxyl Vibrations in Fused Silica 546
A.R. Silin
Raman Scattering from Disordered SiC 549S. Nakashima, H. Ohta and M. Hangyo
Theory of Direct Determination of Phonon-Induced PhaseRelaxation by Two-Step Pulsed Spectral Hole Burning 552
/. Re bane
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Persistent Spectral Holes in Disordered Systems: A Probe ofBarrier Crossing in Double-Well Potentials 555
T. Attenberger, K. Beck and U. Bogner
Optical Heating of Dielectric Glasses: Hole-Burning Study 558A.A. Gorokhovskii, G.S. Zavt and V.V. Palm
Phonon Spectra and Green Functions in a Variety ofFibonacci Lattices . 561
M. Goda, H. Kubo and H. Yamada
Metastable High Pressure Quenched Fee Al-Si Solid Solution 564J. Chevrier, J.B. Suck, J.C. Lasjaunias,J.J. Capponi and M. Perroux
Vibrational Properties of Fibonacci Chains 567H. Bottger and G. Kasner
Vibrational Localization and Thermal Conductivity of aClassical Model of a Two-Dimensional Quasicrystal 570
J. Michalski and P. Erdos
Icosahedral, Glassy and Crystallized AI75CU15V10:A Comparative Study of Their Generalized VibrationalDensity of States 573
J.-B. Suck and H.-J. Guntherodt
A Comparative Study of the Lattice Dynamics of AlCuLi inthe Crystalline R-Phase and the T2-Phase 576
J.-B. Suck, C. Janot, M. de Boissieu and B. Dubost
Elastic Mysteries: Disorder and the Low-Temperature Behaviorof Mechanical Oscillators 579
J.E. van Cleve, J. Chevrier and R.O. Pohl
Glass-Like Lattice Vibrations in Mixed Crystals 582S.K. Watson, D.G. Cahill and R.O. Pohl
Low Temperature Specific Heat in the Orientational Glass(NaCNJi-^KCN)* 585
B. Mertz, R. Bohmer, A. Loidl, J.F.Berret,M. Meissner and W. Knaak
Non-Ergodic Instability and Phonon Damping at anOrientational Glass Transition 588
K.H. Michel and C. Bostoen
Reorientation of Pairs of Coupled XYe Centres inAlkali Halide Crystals 591
T. Kranjc
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Soft Phonons and Central Peak in the Orientational Glass
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Chapter 4: Excitations in Fractal Structures •> 633
Fracton Dynamics of Fractal Structures 635R. Vacher and E. Courtens
New Aspects of Fracton Dynamics from SupercomputerSimulations 646
T. Nakayama
Low-Frequency Vibrational Density of States ofSilica-Aerogels 656
G. Reichenauer, U. Buchenau, H. Conrad,B. Frick and J. Fricke
Excitations on Fractal Structures: Thermal Properties ofSilica Aerogels 659
B. Sake, R. Calemczuk, R. Maynard
Scaling of Higher Order Elasticity in Fractal Aerogels 662P. Xhonneux, E. Courtens, T. Woignier, J. Pelousand R. Vacher
Low-Temperature Thermal Conductivity of Silica-Aerogels 664P. Scheuerpflug, H.-J. Morper, G. Neubert and J. Fricke
Neutron Scattering from Silica: Aerogels, Cabosil andAmorphous Bulk Glass 667
J.H. Page, D. W. Schaefer, J.H. Root, W.J.L. Buyers,C.J. Brinker
Low Frequency Vibrational Modes at the Particle Scale inSilica Aerogels 670
J.L. Sauvajol, J. Pelous, R. Vacher and T. Woignier
Dielectric Long Time Relaxation of PLZT 673R. Ho'hler, G. Kasper, A. Sternberg and A. Krumins
Vibrational Modes in Elastic Percolation Systems 676H. Bottger, A. Freyberg and D. Wegener
Ultrasonic Velocity and Attenuation in a Glass-BeadPercolation System 679
N. Pachet and J.H. Page
Vibrational Density of States of Vector Fractons 682K. Yakubo and T. Nakayama
Test of Scaling for the Vibrational Density of States ofPercolating Systems 685
S. Russ, H.E. Roman and A. Bunde
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Rigidity Percolation in Sei-xGea; Glasses * 688J. Y. Duquesne and G. Bellessa
Fractons in Polymers: Comparative Study by Neutron andRaman Scattering 691
V.K. Malinovsky, V.N. Novikov, P.P. Parshin,A.P. Sokolov and M.G. Zemlyanov
Lattice Vibrations of the Diluted Two^Dimensional CooperativeJahn-Teller System K2Cu3;Zn1_:rF4 694
/. Yamada, Y. Fukada and M. Totani
Neutron Scattering Results on the Density of States ofFractals 697
G. Coddens, J. Pelous, T. Woignier, R. Vacher,E. Courtens and J. Williams
VOLUME 2
Chapter 5: Phonons In Super lattices and Quantum Wells 701
Phonon Transmission through Periodic, Quasiperiodic andRandom Superlattices 703
S. Tamura
Confinement Effects on Free Carrier Scattering fromOptical Phonons in Semiconductor Quantum Wells 713
R. Haupt, L. Wendler, F. Fiedler and F. Bechstedt
Lattice Dynamics of GaSb/InAs Superlattices in aBond-Charge-Model Approach 716
L. Colombo and L. Miglio
Frequency Gaps in Acoustic Phonon Transmission in Periodic,Quasiperiodic and Real Superlattices for Normal Incidence 719
R. Hotz
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