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Dipolar Antiferromagnetism and Quantum Criticality in LiErF_4

Kraemer, Conradin and Nikseresht, Neda and Piatek, Julian O. and Tsyrulin, Nikolay and Dalla Piazza, Bastien and Kiefer, Klaus and Klemke, Bastian and Rosenbaum, Thomas F. and Aeppli, Gabriel and Gannarelli, Ché and Prokes, Karel and Podlesnyak, Andrey and Strässle, Thierry and Keller, Lukas and Zaharko, Oksana and Krämer, Karl W. and Rønnow, Henrik M. (2012) Dipolar Antiferromagnetism and Quantum Criticality in LiErF_4. Science, 336 (6087). pp. 1416-1419. ISSN 0036-8075. doi:10.1126/science.1221878.

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Magnetism has been predicted to occur in systems in which dipolar interactions dominate exchange. We present neutron scattering, specific heat, and magnetic susceptibility data for LiErF_4, establishing it as a model dipolar-coupled antiferromagnet with planar spin-anisotropy and a quantum phase transition in applied field H_(c||) to = 4.0 +/- 0.1 kilo-oersteds. We discovered non-mean-field critical scaling for the classical phase transition at the antiferromagnetic transition temperature that is consistent with the two-dimensional XY/h_4 universality class; in accord with this, the quantum phase transition at H_c exhibits three-dimensional classical behavior. The effective dimensional reduction may be a consequence of the intrinsic frustrated nature of the dipolar interaction, which strengthens the role of fluctuations.

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Alternate Title:Dipolar Antiferromagnetism and Quantum Criticality in LiErF4
Additional Information:© 2012 American Association for the Advancement of Science. Received for publication 13 March 2012. Accepted for publication 19 April 2012. We gratefully acknowledge fruitful discussions with J. Mesot, J. Jensen, A. J. Fisher, S. T. Bramwell, and S. Sachdev; support from Swiss National Science Foundation and Materials with Novel Electronic Properties; and neutron beam access at the Berlin Neutron Scattering Center, Helmholz-Zentrum Berlin, and the Swiss Spallation Neutron Source, Paul Scherrer Institut. Work at the University of Chicago was supported by the U.S. Department of Energy Basic Energy Sciences, the NSF Materials Research Science and Engineering Center, and the London Centre for Nanotechnology by the UK Engineering and Physical Sciences Research Council.
Funding AgencyGrant Number
Swiss National Science FoundationUNSPECIFIED
Department of Energy (DOE) Office of Basic Energy SciencesUNSPECIFIED
NSF Materials Research Science and Engineering CenterUNSPECIFIED
Engineering and Physical Sciences Research Council (EPSRC)UNSPECIFIED
Issue or Number:6087
Record Number:CaltechAUTHORS:20140707-163024560
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46923
Deposited By: George Porter
Deposited On:14 Jul 2014 14:44
Last Modified:10 Nov 2021 17:31

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