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


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



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


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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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.



Physics of magnetic phenomena and physics of ferroics