Magnetocaloric Effect in the One-Dimensio¬nal Spin-1/2 XX Model with Two Periodically Varying g-Factors

Authors

  • O.R. Baran Institute for Condensed Matter Physics, Nat. Acad. of Sci. of Ukraine

DOI:

https://doi.org/10.15407/ujpe68.7.488

Keywords:

one-dimensional quantum spin models, g-factor, Jordan–Wigner fermionization, magnetocaloric effect, quantum phase transition

Abstract

The influence of a non-uniformity of the g-factors with period two on the magnetocaloric effect in the spin-1/2 XX chain in the transverse field has been studied. By means of the Jordan–Wigner transformation, the problem is reduced to the Hamiltonian of noninteracting spinless fermions and solved exactly. The variation of isentropes and the field dependences of the magnetic Gruneisen ratio with a change in the ratio g2/g1 are analyzed. Main attention is paid to the low-temperature region. Distinctions among the magnetocaloric effect manifestations in the cases where the g-factors have different or identical signs, or if either of g-factors equals zero, are demonstrated.

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Published

2023-09-08

How to Cite

Baran, O. (2023). Magnetocaloric Effect in the One-Dimensio¬nal Spin-1/2 XX Model with Two Periodically Varying g-Factors. Ukrainian Journal of Physics, 68(7), 488. https://doi.org/10.15407/ujpe68.7.488

Issue

Section

Physics of magnetic phenomena and physics of ferroics