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Magnetic-field-induced Heisenberg to XY crossover in a quasi-2D quantum antiferromagnet

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, , Citation N A Fortune et al 2014 J. Phys.: Conf. Ser. 568 042004 DOI 10.1088/1742-6596/568/4/042004

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1 Department of Physics, Smith College, Northampton MA, USA

2 National High Magnetic Field Laboratory, Florida State University, Tallahassee FL, USA

3 Department of Physics, Clark University, Worcester MA, USA

4 Department of Chemistry, Clark University, Worcester MA, USA

5 Department of Physics, Durham University, Durham, UK

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1742-6596/568/4/042004

Abstract

The magnetic-field-dependent ordering temperature of the quasi-2D quantum Heisenberg antiferromagnet (QHAF) Cu(pz)2(ClO4)2 was determined by calorimetric measurement in applied dc fields up to 33 tesla. The magnetic phase diagram shows a round maximum at 5.95 K and 17.5 T (at ≈ 1/3 of its saturation field), a 40 percent enhancement of the ordering temperature above the zero field value of 4.25 K. The enhancement and reentrance are consistent with predictions of a field-induced Heisenberg to XY crossover behavior for an ideal 2D QHAF system.

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10.1088/1742-6596/568/4/042004