Thermodynamics of two-dimensional {ital XXZ} easy-plane quantum Heisenberg magnets

Journal Article · Mon Mar 31 23:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365104· OSTI ID:496434

Capriotti, L; Cuccoli, A; Tognetti, V ^[1]; Vaia, R ^[2]; Verrucchi, P ^[3]

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1. Dipartimento di Fisica dell`Universita di Firenze and Istituto Nazionale di Fisica della Materia-INFM, largo E. Fermi 2, I-50125 Firenze (Italy)
2. Istituto di Elettronica Quantistica del Consiglio Nazionale delle Ricerche, via Panciatichi 56/30, I-50127 Firenze (Italy)
3. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX (United Kingdom)

We consider the quantum easy-plane {ital (XXZ)} magnet on the square lattice. In the classical case the system exhibits the Berezinskii{endash}Kosterlitz{endash}Thouless transition. Simulations, both for ferro- and antiferromagnets, using the method of the effective classical Hamiltonian, are made for different spin values and refer to the specific heat, the static spin correlation functions and correlation lengths in a broad range of temperatures, below and above the transition. The effects of quantum fluctuations are quantitatively evaluated and discussed. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496434
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANTIFERROMAGNETISM
CORRELATION FUNCTIONS
FERROMAGNETISM
FLUCTUATIONS
HAMILTONIANS
HEISENBERG MODEL
KOSTERLITZ-THOULESS THEORY
MAGNETISM
QUANTUM MECHANICS
SPECIFIC HEAT
SPIN ORIENTATION
THERMODYNAMICS