V. M. Kalita, V. M. Loktev, “Toward the theory of quantum phase transitions in DTN-type van Vleck antiferromagnets”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2011, Volume 93, Issue 9,Pages <nobr>592

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Toward the theory of quantum phase transitions in DTN-type van Vleck antiferromagnets

V. M. Kalita^a, V. M. Loktev^bc

^a Institute of Physics of the National Academy of Science of Ukraine
^b National Technical University of Ukraine "Kiev Polytechnic Institute"
^c N. N. Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine

Abstract: A magnetic field-induced singlet-to-antiferromagnetic quantum magnetic phase transition has been considered. It has been shown that the phenomenon can be described within an approach similar to the Landau theory of phase transitions. The case of an oblique magnetic field has been studied and the critical field-angle phase diagram has been determined. The phase diagram agrees with the experimental one observed in DTN.

Received: 30.03.2011