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Quantum critical behavior for a model magnet

Bitko, D. and Rosenbaum, T. F. and Aeppli, G. (1996) Quantum critical behavior for a model magnet. Physical Review Letters, 77 (5). pp. 940-943. ISSN 0031-9007. doi:10.1103/PhysRevLett.77.940.

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The classical, thermally driven transition in the dipolar-coupled Ising ferromagnet LiHoF_4 (T_c=1.53K) can be converted into a quantum transition driven by a transverse magnetic field H_t at T=0. The transverse field, applied perpendicular to the Ising axis, introduces channels for quantum relaxation, thereby depressing T_c. We have determined the phase diagram in the H_t−T plane via magnetic susceptibility measurements. The critical exponent, γ=1, has a mean-field value in both the classical and quantum limits. A solution of the full mean-field Hamiltonian using the known LiHoF_4 crystal-field wave functions, including nuclear hyperfine terms, accurately matches experiment.

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Additional Information:© 1996 The American Physical Society. Received 18 March 1996. We have benefited greatly from discussions with R. Wickham. The work at the University of Chicago was supported primarily by the MRSEC Program of the National Science Foundation under Award No. DMR-9400379.
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Issue or Number:5
Classification Code:PACS numbers: 75.40.Cx, 05.30.-d, 75.50.Dd
Record Number:CaltechAUTHORS:20140707-163033724
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46989
Deposited By: George Porter
Deposited On:10 Jul 2014 22:13
Last Modified:10 Nov 2021 17:32

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