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Order-order and order-disorder transitions in the quantum spin-1 Ising-Heisenberg models

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  • Buzano, C.

Abstract

The critical properties of a quantum spin-1 ferromagnetic multidimensional Ising-Heisenberg model with uniaxial and single-ion anisotropy are examined in the framework of a mean-field approximation. A Landau free energy expansion is performed to identify critical lines and surfaces. The resulting phase diagram, defined in a three-dimensional space characterized by a single-ion anisotropy variable, a parameter measuring the interaction anisotropy and the temperature, is particularly interesting because it exhibits three different phases, one paramagnetic and two ferromagnetic; the latter two differing for the orientation of the dipolar ordering. The presence of both first order reorientation transitions (order-order transitions) and order-disorder transitions makes the present model promising for describing several physical systems.

Suggested Citation

  • Buzano, C., 1988. "Order-order and order-disorder transitions in the quantum spin-1 Ising-Heisenberg models," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 150(1), pages 54-76.
    • Handle: RePEc:eee:phsmap:v:150:y:1988:i:1:p:54-76
    DOI: 10.1016/0378-4371(88)90050-7
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    1. Griffiths, Mary, 1977. "Nutrition : Second European nutrition conference, Munich, 14-17 September 1976," Food Policy, Elsevier, vol. 2(1), pages 76-77, February.
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