High-resolution phonon energy shift measurements with the inelastic neutron spin echo technique

Journal article (2019)

Authors

Fankang Li Oak Ridge National Laboratory
Jiazhou Shen Indiana University - Purdue University
S.R. Parnell RST/Fundamental Aspects of Materials and Energy - AS
Alex N. Thaler Oak Ridge National Laboratory
Masaaki Matsuda Oak Ridge National Laboratory
Thomas Keller Max-Planck-Institut für Festkörperforschung
Olivier Delaire Duke University
Roger Pynn Oak Ridge National Laboratory, Indiana University - Purdue University
Jaime A. Fernandez-Baca Oak Ridge National Laboratory
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Copyright: © 2019 Fankang Li, Jiazhou Shen, S.R. Parnell, Alex N. Thaler, Masaaki Matsuda, Thomas Keller, Olivier Delaire, Roger Pynn, Jaime A. Fernandez-Baca
DOI: https://doi.org/10.1107/S1600576719008008
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Published Date

2019

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

The energy resolution of the conventional way of measuring a small change in a phonon dispersion curve using neutron scattering is restricted by the relatively coarse intrinsic resolution ellipsoid of the neutron triple-axis spectrometer (TAS). By implementing inelastic neutron spin echo on the host TAS using the Larmor precession of the neutron spin, the energy resolution of such measurements can be further improved without reducing the resolution ellipsoid. Measurements of the temperature-dependent phonon energy change are demonstrated using superconducting magnetic Wollaston prisms at the HB-1 instrument of the High-Flux Isotope Reactor at Oak Ridge National Laboratory, and the achievable resolution is <10 µeV.

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