Thermodynamics of low-dimensional spin-1/2 Heisenberg ferromagnets in an external magnetic field within a Green function formalism

T. N. Antsygina; M. I. Poltavskaya; I. I. PoltavskyK. A. Chishko

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Thermodynamics of low-dimensional spin-1/2 Heisenberg ferromagnets in an external magnetic field within a Green function formalism

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The thermodynamics of low-dimensional spin-1/2 Heisenberg ferromagnets (HFMs) in an external magnetic field is investigated within a second-order two-time Green function formalism in the wide temperature and field ranges. A crucial point of the proposed scheme is a proper account of the analytical properties for the approximate transverse commutator Green function obtained as a result of the decoupling procedure. A good quantitative description of the correlation functions, magnetization, susceptibility, and heat capacity of the HFMs on a chain and square and triangular lattices is found for both infinite-and finite-sized systems. The dependences of the thermodynamic functions of two-dimensional HFMs on the cluster size are studied. The obtained results agree well with the corresponding data found by Bethe ansatz, exact diagonalization, high temperature series expansions, and quantum Monte Carlo simulations.

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《Physical review, B. Condensed matter and materials physics》 |2008年第2期|024407.1-024407.10|共1页
作者
T. N. Antsygina; M. I. Poltavskaya; I. I. PoltavskyK. A. Chishko;
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B. Verkin Institute for Low Temperature Physics and Engineering, 47 Lenin Avenue, 61103 Kharkov, Ukraine;

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正文语种英语
中图分类固体物理学;
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static properties (order parameter; static susceptibility; heat capacities; critical exponents; etc.);

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Thermodynamics of low-dimensional spin-1/2 Heisenberg ferromagnets in an external magnetic field within a Green function formalism

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