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Title: Measurement of the spin-excitation continuum in one-dimensional KCuF{sub 3} using neutron scattering

Abstract

In this, and the following paper, we present the results of a detailed experimental investigation into the spin dynamics of the quasi-one-dimensional {ital S}=1/2 Heisenberg antiferromagnet KCuF{sub 3}. In this paper we report results of inelastic neutron-scattering measurements made using the MARI time-of-flight spectrometer at the Rutherford Appleton Laboratory. Measurement of the magnetic excitation spectrum was made in both the low-temperature phase, where the chains are ordered together, and in the high-temperature phase, where the correlations between chains become unimportant. We compare our measurements with the Mueller ansatz, which is identified with a two-spinon cross section, and find excellent agreement with this. The effect of temperature on the excitation continuum was also investigated. A series of measurements were made at temperatures ranging from 20 to 200 K. These results are compared to the predictions of field theory for the one-dimensional Heisenberg chain. Again good agreement is found with the theoretical predictions. In the following paper measurements of the low-energy scattering in the ordered phase, made on a triple-axis spectrometer, are presented.

Authors:
;  [1];  [2];  [3]
  1. Oxford Physics, Clarendon Laboratory, Oxford University, Parks Road, Oxford OX1 3PU (United Kingdom)
  2. Department of Physics, University of Florida, Gainesville, Florida 32611 (United States)
  3. Oxford Physics, Department of Theoretical Physics, Oxford University, Keble Road, Oxford OX1 3PU (United Kingdom)
Publication Date:
OSTI Identifier:
165775
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 52; Journal Issue: 18; Other Information: PBD: 1 Nov 1995
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COPPER FLUORIDES; COLLECTIVE EXCITATIONS; POTASSIUM FLUORIDES; ANTIFERROMAGNETIC MATERIALS; HEISENBERG MODEL; INELASTIC SCATTERING; MAGNETIC PROPERTIES; NEUTRON BEAMS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0065-0273 K

Citation Formats

Tennant, D A, Cowley, R A, Nagler, S E, and Tsvelik, A M. Measurement of the spin-excitation continuum in one-dimensional KCuF{sub 3} using neutron scattering. United States: N. p., 1995. Web. doi:10.1103/PhysRevB.52.13368.
Tennant, D A, Cowley, R A, Nagler, S E, & Tsvelik, A M. Measurement of the spin-excitation continuum in one-dimensional KCuF{sub 3} using neutron scattering. United States. https://doi.org/10.1103/PhysRevB.52.13368
Tennant, D A, Cowley, R A, Nagler, S E, and Tsvelik, A M. Wed . "Measurement of the spin-excitation continuum in one-dimensional KCuF{sub 3} using neutron scattering". United States. https://doi.org/10.1103/PhysRevB.52.13368.
@article{osti_165775,
title = {Measurement of the spin-excitation continuum in one-dimensional KCuF{sub 3} using neutron scattering},
author = {Tennant, D A and Cowley, R A and Nagler, S E and Tsvelik, A M},
abstractNote = {In this, and the following paper, we present the results of a detailed experimental investigation into the spin dynamics of the quasi-one-dimensional {ital S}=1/2 Heisenberg antiferromagnet KCuF{sub 3}. In this paper we report results of inelastic neutron-scattering measurements made using the MARI time-of-flight spectrometer at the Rutherford Appleton Laboratory. Measurement of the magnetic excitation spectrum was made in both the low-temperature phase, where the chains are ordered together, and in the high-temperature phase, where the correlations between chains become unimportant. We compare our measurements with the Mueller ansatz, which is identified with a two-spinon cross section, and find excellent agreement with this. The effect of temperature on the excitation continuum was also investigated. A series of measurements were made at temperatures ranging from 20 to 200 K. These results are compared to the predictions of field theory for the one-dimensional Heisenberg chain. Again good agreement is found with the theoretical predictions. In the following paper measurements of the low-energy scattering in the ordered phase, made on a triple-axis spectrometer, are presented.},
doi = {10.1103/PhysRevB.52.13368},
url = {https://www.osti.gov/biblio/165775}, journal = {Physical Review, B: Condensed Matter},
number = 18,
volume = 52,
place = {United States},
year = {1995},
month = {11}
}