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Contribution of spin pairs to the magnetic response in a dilute dipolar ferromagnet

Gannarelli, C. M. S. and Silevitch, D. M. and Rosenbaum, T. F. and Aeppli, G. and Fisher, A. J. (2012) Contribution of spin pairs to the magnetic response in a dilute dipolar ferromagnet. Physical Review B, 86 (1). Art. No. 014420. ISSN 1098-0121. doi:10.1103/PhysRevB.86.014420.

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We simulate the dc magnetic response of the diluted dipolar-coupled Ising magnet LiHo_(0.045)Y_(0.955)F_4 in a transverse field, using exact diagonalization of a two-spin Hamiltonian averaged over nearest-neighbor configurations. The pairwise model, incorporating hyperfine interactions, accounts for the observed drop-off in the longitudinal (c-axis) susceptibility with increasing transverse field; with the inclusion of a small tilt in the transverse field, it also accounts for the behavior of the off-diagonal magnetic susceptibility. The hyperfine interactions do not appear to lead to qualitative changes in the pair susceptibilities, although they do renormalize the crossover fields between different regimes. The comparison with experiment indicates that antiferromagnetic correlations are more important than anticipated based on simple pair statistics and our first-principles calculations of the pair response. This means that larger clusters will be needed for a full description of the reduction in the diagonal response at small transverse fields.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Silevitch, D. M.0000-0002-6347-3513
Fisher, A. J.0000-0001-9754-4618
Additional Information:©2012 American Physical Society. (Received 18 August 2010; revised manuscript received 24 February 2012; published 19 July 2012). The work at the University of Chicago was supported by US Department of Energy Basic Energy Sciences Grant No. DE-FG02-99ER45789, and that at UCL by the UK Engineering and Physical Sciences Research Council under Grant No. EP/D049717/1.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-99ER45789
Engineering and Physical Sciences Research Council (EPSRC)EP/D049717/1
Issue or Number:1
Classification Code:PACS: 75.50.Lk, 75.45.+j, 75.40.Cx, 75.10.Dg
Record Number:CaltechAUTHORS:20140707-131949650
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46896
Deposited By: George Porter
Deposited On:14 Jul 2014 14:26
Last Modified:10 Nov 2021 17:31

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