Critical properties of the spin-1 Blume-Capel model with a random transverse crystal field

被引：1

作者：

Kple, J. ^{[1
,2
]}

Hontinfinde, F. ^{[1
,2
]}

Albayrak, E. ^{[3
]}

机构：

[1] Inst Math & Phys Sci IMSP, Dangbo, Benin

[2] Univ Abomey Calavi, Dept Phys, Godomey, Benin

[3] Erciyes Univ, Dept Phys, TR-38039 Kayseri, Turkey

来源：

PHYSICA B-CONDENSED MATTER | 2022年 / 626卷

关键词：

Random transverse crystal field; Blume-Capel; Spin-1; Tricritical point; Critical end point; MAGNETIC-PROPERTIES; ISING-MODEL; TRICRITICAL BEHAVIOR; PHASE-DIAGRAMS; MIXED SPIN-1/2; FERROMAGNETS; SYSTEM;

D O I：

10.1016/j.physb.2021.413515

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The random transverse crystal field (RTCF) chosen to be along the x-axis is applied to the spin-1 Blume-Capel (BC) model and the mean-field approximation (MFA) is employed to investigate the behaviors of order-parameters and to obtain its phase diagrams. The selected form of the RTCF is in a bimodal form which is either turned on with probability p or turned off with 1 - p on the sites of spin-1. The effects of the longitudinal and transverse crystal fields, i.e. D-2 and D-x respectively, number of nearest-neighbors (NN) q, bilinear exchange interaction parameter J between the NN spins along the z-axis and temperature are analyzed in detail. The emphasis is given to the square lattice with q = 4. It is found that the model displays first- and second-order phase transitions with the existence of tricritical point (TCP), critical end-points (CEP) and end-points (EP).

引用

页数：8

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