Nuclear Resonant Scattering under High Pressure at HPCAT

Yuming Xiao

Nov 9, 2014, Nuclear Resonant Scattering Workshop, Argonne, IL

Outline

• Introduction to 16 IDD of HPCAT

• Nuclear Resonant Scattering Program at HPCAT

• Research examples

ID-A: First Optics Enclosure

ID-C: Second Optics Enclosure

ID-D: The Experimental Station

X-RAY SPECTROSCOPY BEAMLINE AT HPCAT

Introduction to 16 IDD of HPCAT (I)

Introduction to 16 IDD of HPCAT (II)         

30 (V) x 50 (H) µm with 1-meter KB mirrors

30 (V) x 10 (H) µm with 1-meter vertical KB and 200 mm Horizonttal KB mirrors

4 (V) x 5 (H) µm with 200 mm KB mirrors

Bruker liquid N2 cooled Si (1 1 1) DCM

Energy range 4.5-35keV

APS undulator 3.0

Introduction to 16 IDD of HPCAT (III)         

Techiniques available:Resonance/X-ray Emission Spectroscopy (~1eV energy resolution, LT down to ~10K)

Inelastic X-ray Scattering (electronic excitation at low q and core electron excitation at large scattering angle (XRS), ~1eV energy resolution)

Nuclear Resonant Scattering (~2meV energy resolution for 57Fe, LT down to ~4K for NFS ， whole cell heating furnace, in-situ XRD)

x-ray

Lin et al. PRL, 107, 175504 (2011)

Mao et al. PNAS, 108 (2011)

Nuclear Resonant Scattering

NRIXS

partial density of states (DOS): vibrational kinetic energy, vibrational entropy, Debye temperature, and Debye sound velocity

NFS

hypefine interactions: valence, spin state and magnetic ordering

NRS Program at HPCAT~20% beamtime for NRS program

Applications in: Geophysics

Condensed Matter Physics

Material Science

two cryostats for NFS experiments with membrane pressure control, online ruby system

MembraneMembrane box

Pressure-induced invar behavior in Pd3Fe

Winterrose et al. PRL 102, 237202 (2009)

The NFS revealed a collapse of the 57Fe magnetic moment between 8.9 and 12.3 GPa at 300 K, coinciding with a transition in bulk modulus found by XRD.

Winterrose et al. PRB 83, 134304 (2011)

Magnetic P-T phase diagram of langasite Ba3TaFe3Si2O14

Gavriliuk et al., APL, 103, 162402 (2013)

Tanis et al. unpublished

DyFe3 under high pressure

DyFe3

Positive Vibrational Entropy of Chemical Ordering in FeV

Munoz et al. Phys. Rev. Letter, 2011

Phonons in the B2 ordered phase are softer than in the bcc solid solution. This result is contrary to the behavior of ordering alloys to date. First-principles calculations which showed that electronic screening is enhanced during ordering process and thus the average energy of phonons was reduced.

FeSe under High Pressure

Kumar et al. J.Phys.Chem. B, 2010 Kumar et al. APL, 2011

Future Developments and Plans

more working APD detectors

mechanical chopper/shutter

HP-LT NRIXS

AcknowledgementsSector3, APS

Ercan Alp

Jiyong Zhao

Tom Toellner

Michael Hu

HPCAT 16 ID-D Users

HPCAT is supported by CIW, CDAC, UNLV and LLNL through funding from DOE-NNSA, DOE-BES and NSF. APS is supported by DOE-BES, under Contract No. DE-AC02-06CH11357.

HPCAT Paul Chow

Genevieve Boman

Eric Rod

Curtis Kenny-Benson

Arun Bommannavar

Guoyin Shen

Thank you!