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

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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [4];  [5]; ORCiD logo [6]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Indiana Univ., Bloomington, IN (United States)
  3. Delft Univ. of Technology (Netherlands)
  4. Max-Planck-Inst. fur Festkorperforschung, Stuttgart (Germany)
  5. Duke Univ., Durham, NC (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Indiana Univ., Bloomington, IN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1546533
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Crystallography (Online)
Additional Journal Information:
Journal Name: Journal of Applied Crystallography (Online); Journal Volume: 52; Journal Issue: 4; Journal ID: ISSN 1600-5767
Publisher:
International Union of Crystallography
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; inelastic neutron spin echo; neutron Larmor labeling; high energy resolution; inelastic neutron scattering.

Citation Formats

Li, Fankang Frank, Shen, Jiazhou, Parnell, Steven R., Thaler, Alex Nicholas, Matsuda, Masaaki, Keller, Thomas, Delaire, Olivier, Pynn, Roger R., and Fernandez-Baca, Jaime A. High-resolution phonon energy shift measurements with the inelastic neutron spin echo technique. United States: N. p., 2019. Web. doi:10.1107/S1600576719008008.
Li, Fankang Frank, Shen, Jiazhou, Parnell, Steven R., Thaler, Alex Nicholas, Matsuda, Masaaki, Keller, Thomas, Delaire, Olivier, Pynn, Roger R., & Fernandez-Baca, Jaime A. High-resolution phonon energy shift measurements with the inelastic neutron spin echo technique. United States. https://doi.org/10.1107/S1600576719008008
Li, Fankang Frank, Shen, Jiazhou, Parnell, Steven R., Thaler, Alex Nicholas, Matsuda, Masaaki, Keller, Thomas, Delaire, Olivier, Pynn, Roger R., and Fernandez-Baca, Jaime A. Fri . "High-resolution phonon energy shift measurements with the inelastic neutron spin echo technique". United States. https://doi.org/10.1107/S1600576719008008. https://www.osti.gov/servlets/purl/1546533.
@article{osti_1546533,
title = {High-resolution phonon energy shift measurements with the inelastic neutron spin echo technique},
author = {Li, Fankang Frank and Shen, Jiazhou and Parnell, Steven R. and Thaler, Alex Nicholas and Matsuda, Masaaki and Keller, Thomas and Delaire, Olivier and Pynn, Roger R. and Fernandez-Baca, Jaime A.},
abstractNote = {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.},
doi = {10.1107/S1600576719008008},
journal = {Journal of Applied Crystallography (Online)},
number = 4,
volume = 52,
place = {United States},
year = {Fri Jun 28 00:00:00 EDT 2019},
month = {Fri Jun 28 00:00:00 EDT 2019}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 4 works
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Figures / Tables:

Fig. 1 Fig. 1: (a) A typical phonon dispersion curve, where the displacement between grey and blue curves denotes a phonon energy change to $E^{′}_{p}$ due to, for example, temperature. The ellipse denotes the slice of the resolution function of the TAS. (b) The schematic drawing of the spin echo setup onmore » a TAS used for this measurement, where the TAS components have been omitted for clarity. The rectangular boxes are the magnetic field regions defined by the Meissner effect provided by the high temperature superconducting films. The insert figure shows the Larmor precession of a neutron spin S in a given magnetic field B, indicated by the rotating arrow around the vertical axis. The size of each arm along the beam path is ∼ 32cm. $k_{i,f}$, $E_{i,f}$ and $Ψ_{i,f}$ are the wave vectors, energy and Larmor phase of the neutrons with (i, f) denoting the incoming and outgoing neutrons. The arrows indicate the neutrons trajectories focused towards the sample.« less

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Works referencing / citing this record:

Design and performance of a superconducting neutron resonance spin flipper
journal, January 2020

  • Dadisman, Ryan; Wasilko, David; Kaiser, Helmut
  • Review of Scientific Instruments, Vol. 91, Issue 1
  • DOI: 10.1063/1.5124681

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.