MAGNETOCALORIC EFFECT IN THE ONE-DIMENSIONAL SPIN-1/2 XX MODEL WITH TWO PERIODICALLY VARYING g-FACTORS

被引:1
作者
Baran, O. R.
机构
[1] Institute for Condensed Matter Physics, Nat. Acad. of Sci. of Ukraine, 1, Svientitskii Str., Lviv
来源
UKRAINIAN JOURNAL OF PHYSICS | 2023年 / 68卷 / 07期
关键词
one-dimensional quantum spin models; g-factor; Jordan-Wigner fermionization; magnetocaloric effect; quantum phase transition; CHERN-SIMONS THEORY; FIELD-INDUCED GAP; SQUARE-LATTICE; XY CHAIN; MAGNETIC-PROPERTIES; HEISENBERG-MODEL; GROUND-STATE; ISING-MODEL; DYNAMICS;
D O I
10.15407/ujpe68.7.488
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 g(2)/g(1) 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.
引用
收藏
页码:490 / +
页数:15
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