Current 5 year plan (Sonier) 1. A high field low temperature muSR spectrometer (MacLaughlin and...
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Transcript of Current 5 year plan (Sonier) 1. A high field low temperature muSR spectrometer (MacLaughlin and...
Current 5 year plan (Sonier)
1. A high field low temperature muSR spectrometer (MacLaughlin and Kiefl)
2. Low energy muon beamline 1000 +/s at TRIUMF. (Morenzoni-PSI, Bakule+Matsuda- RIKEN and Brewer)
3. Independent source of 8Li for beta-NMR (MacFarlane and Morris)
Summary of Materials Science Breakout Session
Major components of the last 5 year plan (Sonier)
M20CFI $2.4M +Matching funds=$6M
TRIUMF$2.22M
SR at 15T and 20 mK (MacLaughlin)
Lévy et al. 05
e.g. Field-Induced Superconductivity in URhGee.g. Field-Induced Superconductivity in URhGe
Existing Hightime spectrometer TRIUMF is 8T/2K=4T/KB/T in New spectrometer ~200 times larger!
What is the interest in low T and high B ?CMP is the study of the collective behaviour of electronsLow T ground state and elementary excitationsHigh B/T Zeeman energy>> kTnew ground states new properties
Detector arrangement (Kiefl)Top view
Cold finger
F
VetoVeto
TM
sample
10 mm
L
R
77K
4K
B=15T
1. Split Solenoid 15T ~$1M2. Cryostat inserts 2K, 300mK and 20 mK+ detectors ~$1M
Confinement another way to significantly alter electronic and magnetic properties of electrons at
interfaces, near surfaces and thin films (Morenzoni and MacFarlane)
t
A B
LBLA
Magnetic properties change as a function of thickness and depthMorenzoni
G. Nieuwenhuys, E. Morenzoni, S. Vongtragool, H. Luetkens, A. Suter, Th. Prokscha, F. Galli, M. Hesselberth submitted to PRL 2007
LE muSR in Fe/Ag Magnetic Multilayers
4nm 20nm 4nmH. Luetkens, J. Korecki, E. Morenzoni, T. Prokscha, M. Birke, H. Glückler, R. Khasanov, H.-H. Klauss, T. Slezak, A. Suter, E. M. Forgan, Ch. Niedermayer, and F. J. Litterst Phys Rev. Lett. 91, 017204 (2003).
Magnetic field distribution in Ag
Low-energy muon-spin-rotation studies on thin film multilayers consisting of cuprate high-TC sc and FM oxides
Microscopic investigations of a metal-superconductor proximity bilayer
Motion and Pinning of hole-poor pockets in cuprates
Charge differentiation of positive muons in insulators and semiconductors at low implantation energies
Magnetic and superconducting properties of electron-Doped La2-xCexCuO4 epitaxial thin films
Conduction Electron Spin Polarization of the Nonmagnetic Layers of FM/NM Heterostructures
Superconductivity and magnetism in YBa2Cu3O7/PrBa2Cu3O7/YBa2Cu3O7 tri-layers
Spin Freezing in underdoped HTS
Spin Coherent Transport in Organic Spin Valves
Studies of Polymer Surface Dynamics
Influence of electric fields on manganites studied by low-energy muon precession.
Study of Superconducting-Magnetic Coupling in Superconducting Spin Valve Structures
Ferromagnetism in III-V and II-IV-V2 dilute magnetic semiconductors
Proximity effect in Pd/Fe bilayers and Fe/Pd/Fe trilayers.
LE muon Proposals at PSI in 2007 Morenzoni
Low energy µSR study of moving vortices in type-II superconductors.
Magnetic Penetration in a Superconducting Sandwich and Thin Film
Organic thin-films and solar cells
Investigation of magnetism in HfO2 and related systems
Induced ferromagnetism in superconducting layer of superconductor/ferromagnet heterostructures
Low Energy MuSR Studies of Mn doped GaAs
Measurement of the Magnetic Properties of a mono-Layer of Single Molecule Magnets
Magnetism in Proton-Irradiated HOPG Carbon
A direct measurement of the interplay between ferromagnetism and superconductivity at atomically flat oxide interfaces.
Spin-polarized injection from a magnetic semiconductor into a nonmagnetic semiconductor: spintronics via μSR
LE muon proposals at PSI cont’d
Structural phase near the surface of SrTiO3 at 150K Salman et al. PRL 96, 147601 (2006)
0 2000 40000.0
1.0
2.0
3.0
0 50 100 150 200 250 300
0.25
0.50
0.75
1.00
Depth [Å]
Impl
ante
d [%
]
Nor
mal
ized
Pol
ariz
atio
n
T [K]
Tc bulk
MacFarlane
Progress in βNMR
Project Publications
High Spin Molecules on Surfaces Nano Letters (07)
Near Surface Vortex State of NbSe2
Phys Rev Lett, 98, 167001 (07)
Thin Metal Films Phys Rev Lett 98, 047601 (07)
Phys Rev B 75, 073405 (07)
Phys Rev Lett 93, 157601 (04)
Surface Effects on Phase Transitions
Phys Rev Lett 96, 147601 (06)
7+ low energy expts,6 w/ accelerated beam,two RIB sourcesONE mass separator
Can’t make a big impact3 weeks/year no good
“ “µSR Ghetto” µSR Ghetto” “ “µSR Ghetto” µSR Ghetto”
MESON HALLBEAM DUMP
MESON HALLBEAM DUMP
150 µA beam dump
BL1BL1
Surface Muon SourceSurface Muon Source Custom Production Targetin a “magnetic bottle” for pions
“Dai Omega” styleHigh Flux Surface µ+ Beam
Low Energy µ+ Beam
150 µA
T2
TNF(moved)
M9
M20
$$$
Brewer
1. Independent source of 8Li for beta-NMR at TNF or proton hall
2. A high field low temperature muSR spectrometer. CFI +Japanese funding?
3. A low energy muon beamline with 1000 +/s at the sample could probably be made here at TRIUMF. However the money might be better spent helping to build a low energy muon at J-PARC.
Conclusion