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Dipolar Antiferromagnetism and Quantum Criticality in LiErF4

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Kraemer Conradin, Nikseresht Neda, Piatek Julian O., Tsyrulin Nikolay, Dalla Piazza Bastien, Kiefer Klaus, Klemke Bastian, Rosenbaum Thomas F., Aeppli Gabriel, Gannarelli Che, Prokes Karel, Podlesnyak Andrey, Straessle Thierry, Keller Lukas, Zaharko Oksana, Kraemer Karl W., Ronnow Henrik M.,
Project Setup for studies of quantum phenomena in condensed matter systems at ultra-low temperatures in magnetic vector fields
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Original article (peer-reviewed)

Journal SCIENCE
Volume (Issue) 336(6087)
Page(s) 1416 - 1419
Title of proceedings SCIENCE
DOI 10.1126/science.1221878

Open Access

URL https://infoscience.epfl.ch/record/178742
Type of Open Access Repository (Green Open Access)

Abstract

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 LiErF4, establishing it as a model dipolar-coupled antiferromagnet with planar spin-anisotropy and a quantum phase transition in applied field H-c parallel 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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