Phase transitions in two-dimensional anisotropic quantum magnets

A. Cuccoli, T. Roscilde, V. Tognetti, R. Vaia and P. Verrucchi
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A. Cuccoli: Dipartimento di Fisica dell'Università di Firenze and Istituto Nazionale di Fisica della Materia (INFM), Largo E. Fermi 2, 50125 Firenze, Italy
T. Roscilde: Dipartimento di Fisica “A. Volta” dell'Università di Pavia and INFM, via Bassi 6, 27100 Pavia, Italy
V. Tognetti: Dipartimento di Fisica dell'Università di Firenze and Istituto Nazionale di Fisica della Materia (INFM), Largo E. Fermi 2, 50125 Firenze, Italy
R. Vaia: Istituto di Elettronica Quantistica del Consiglio Nazionale delle Ricerche and INFM, via Panciatichi 56/30, 50127 Firenze, Italy
P. Verrucchi: Dipartimento di Fisica dell'Università di Firenze and Istituto Nazionale di Fisica della Materia (INFM), Largo E. Fermi 2, 50125 Firenze, Italy

The European Physical Journal B: Condensed Matter and Complex Systems, 2001, vol. 20, issue 1, 55-64

Abstract: Abstract: We consider quantum Heisenberg ferro- and antiferromagnets on the square lattice with exchange anisotropy of easy-plane or easy-axis type. The thermodynamics and the critical behaviour of the models are studied by the pure-quantum self-consistent harmonic approximation, in order to evaluate the spin and anisotropy dependence of the critical temperatures. Results for thermodynamic quantities are reported and comparison with experimental and numerical simulation data is made. The obtained results allow us to draw a general picture of the subject and, in particular, to estimate the value of the critical temperature for any model belonging to the considered class.

Keywords: PACS. 75.10.Jm Quantized spin models – 75.10.-b General theory and models of magnetic ordering – 75.40.Cx Static properties (order parameter; static susceptibility; heat capacities; critical exponents; etc.) (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/BF01313912

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