Thermodynamic properties of the XY ferrimagnetic spin-(1/2,1) chain with both longitudinal and transverse single-ion anisotropies

被引：1

作者：

Yang, Xin ^{[1
]}

Chen, Yuge ^{[2
]}

Lu, Mengmeng ^{[1
]}

Chen, Bin ^{[1
]}

机构：

[1] Univ Shanghai Sci & Technol, Coll Sci, Shanghai 200093, Peoples R China

[2] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

来源：

PHYSICS LETTERS A | 2019年 / 383卷 / 22期

关键词：

XY ferrimagnetic spin chain; Villian transformation; Single-ion anisotropies; Thermodynamic quantities; MEAN-FIELD THEORY; VILLAIN TRANSFORMATION; MAGNETIC-PROPERTIES; SPIN-1/2;

D O I：

10.1016/j.physleta.2019.05.026

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the finite temperature properties of the mixed spin-1/2 and spin-1 ferrimagnetic chain with both longitudinal single-ion anisotropy D-z and transverse single-ion anisotropy D-x. The spin excitation spectrum as well as the thermodynamic quantities are explored by means of the Villian transformation theory. We find two branches of the low-lying energy spectrum are strongly dependent on the model Hamiltonian parameters J(1), J(2), D-z,D-x. Our results agree well with the exact method results for the mixed spin-1/2 and spin-1 (sing chain. The thermodynamic quantities of XY ferrimagnetic spin-(1/2, 1) chain varying with D-z and D-x, such as free energy, internal energy, entropy, specific heat and magnetization are explicitly discussed, respectively. The result shows that the magnetization plateaux exists in XY ferrimagnetic spin chain without anisotropy, which indicates a phase transition may occur in XY ferrimagnetic spin chain. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：2633 / 2639

页数：7

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