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

TitleHigh-resolution phonon energy shift measurements with the inelastic neutron spin echo technique
Publication TypeJournal Article
Year of Publication2019
AuthorsF Li, J Shen,, AN Thaler, M Matsuda, T Keller, O Delaire, R Pynna, and JA Fernandez-Baca
JournalJournal of Applied Crystallography
Volume52
Issue4
Start Page755
Pagination755 - 760
Date Published08/2019
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 magneticWollaston prisms at the HB-1 instrument of the High-Flux Isotope Reactor at Oak Ridge National Laboratory, and the achievable resolution is <10 meV.

DOI10.1107/S1600576719008008
Short TitleJournal of Applied Crystallography