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

Rønnow, H. M. and Jensen, J. and Parthasarathy, R. and Aeppli, G. and Rosenbaum, T. F. and McMorrow, D. F. and Kraemer, C. (2007) Magnetic excitations near the quantum phase transition in the Ising ferromagnet LiHoF_4. Physical Review B, 75 (5). Art. No. 054426. ISSN 1098-0121. doi:10.1103/PhysRevB.75.054426.

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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.

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Alternate Title:Magnetic excitations near the quantum phase transition in the Ising ferromagnet LiHoF4
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.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-99ER45789
Wolfson–Royal Society ProgramUNSPECIFIED
Research Councils UK (RCUK)UNSPECIFIED
Issue or Number:5
Classification Code:PACS: 75.10.Jm, 75.40.Gb, 75.50.Dd
Record Number:CaltechAUTHORS:20140707-163027665
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46946
Deposited By: George Porter
Deposited On:09 Jul 2014 21:29
Last Modified:10 Nov 2021 17:31

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