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Nuclear Resonant Scattering at High Pressure: Applications and Techniques

Explore research examples and techniques in Nuclear Resonant Scattering under high pressure at HPCAT, covering geophysics, condensed matter physics, and material science. Discover how NRS reveals insights into magnetic ordering and vibrational entropy. Future plans include enhancements like more APD detectors and HP-LT NRIXS. Acknowledgements to HPCAT contributors and supporting agencies.

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Nuclear Resonant Scattering at High Pressure: Applications and Techniques

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  1. Nuclear Resonant Scattering under High Pressure at HPCAT YumingXiao Nov 9, 2014, Nuclear Resonant Scattering Workshop, Argonne, IL

  2. Outline • Introduction to 16 IDD of HPCAT • Nuclear Resonant Scattering Program at HPCAT • Research examples

  3. Introduction to 16 IDD of HPCAT (I)

  4. Introduction to 16 IDD of HPCAT (II) APS undulator 3.0 30 (V) x 10 (H) µm with 1-meter vertical KB and 200 mm Horizonttal KB mirrors 30 (V) x 50 (H) µm with 1-meter KB mirrors • Bruker liquid N2 cooled Si (1 1 1) DCM • Energy range 4.5-35keV 4 (V) x 5 (H) µm with 200 mm KB mirrors

  5. 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 Mao et al. PNAS, 108 (2011) Lin et al. PRL, 107, 175504 (2011)

  6. 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

  7. Membrane Membrane box 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

  8. Pressure-induced invar behavior in Pd3Fe 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) Winterrose et al. PRL 102, 237202 (2009)

  9. Magnetic P-T phase diagram of langasite Ba3TaFe3Si2O14 Gavriliuk et al., APL, 103, 162402 (2013)

  10. DyFe3 under high pressure DyFe3 Tanis et al. unpublished

  11. Positive Vibrational Entropy of Chemical Ordering in FeV 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. Munoz et al. Phys. Rev. Letter, 2011

  12. FeSe under High Pressure Kumar et al. APL, 2011 Kumar et al. J.Phys.Chem. B, 2010

  13. Future Developments and Plans • more working APD detectors • mechanical chopper/shutter • HP-LT NRIXS

  14. Acknowledgements HPCAT • Paul Chow • Genevieve Boman • Eric Rod • Curtis Kenny-Benson • Arun Bommannavar • Guoyin Shen Sector3, 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.

  15. Thank you!

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