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Updated: May 21, 2026

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Dipolar antiferromagnetism and quantum criticality in LiErF₄
Conradin Kraemer1, Neda Nikseresht, Julian O Piatek
1Laboratory for Quantum Magnetism, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
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 LiErF(4), establishing it as a model dipolar-coupled antiferromagnet with planar spin-anisotropy and a quantum phase transition in applied field H(c|| = 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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