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Published February 1, 2007 | Version Published
Journal Article Open

Magnetic excitations near the quantum phase transition in the Ising ferromagnet LiHoF_4

Creators

  • 1. ROR icon École Polytechnique Fédérale de Lausanne
  • 2. ROR icon Paul Scherrer Institute
  • 3. ROR icon University of Copenhagen
  • 4. ROR icon University of Chicago
  • 5. ROR icon University College London

Abstract

Effective-medium theory and inelastic neutron scattering are used to study the magnetic excitations in the Ising ferromagnet LiHoF_4 near its magnetic-field-induced quantum phase transition (QPT). As expected, the dominant mode softens at the QPT, but reaches a finite, rather than vanishing, limit due to the hyperfine interaction. The experimental phase diagram and excitation spectra are well described by an effective-medium theory to first order in the 1/z expansion. There are some differences between theory and experiments, which may be due to domain walls, their dynamics and shape effects, and to magnetoelastic couplings.

Additional Information

© 2007 The American Physical Society. Received 4 April 2006; revised manuscript received 19 October 2006; published 28 February 2007. We thank M. Schechter for stimulating discussions and G. McIntyre for assistance during complementing measurements on the D10 diffractometer at Institut Laue Langevin, France. Work at the University of Chicago was supported by NSF Materials Research Science and Engineering Centers Grant No. DMR-0213745 and U.S. Department of Energy Grant No. DE-FG02-99ER45789. Work in London was supported by the Wolfson–Royal Society Program and the Basic Technologies program of the U.K. Research Councils.

Attached Files

Published - PhysRevB.75.054426.pdf

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PhysRevB.75.054426.pdf

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Additional details

Additional titles

Alternative title
Magnetic excitations near the quantum phase transition in the Ising ferromagnet LiHoF4

Identifiers

Eprint ID
46946
Resolver ID
CaltechAUTHORS:20140707-163027665

Funding

NSF
DMR-0213745
Department of Energy (DOE)
DE-FG02-99ER45789
Wolfson–Royal Society Program
Research Councils UK (RCUK)

Dates

Created
2014-07-09
Created from EPrint's datestamp field
Updated
2021-11-10
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Caltech groups
Physics Department