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中国物理B：英文版

Critical properties of the transverse ferromagnetic spin system with random single-ion anisotropy

邓玲玲, 晏世雷

Published Jun 13, 2005• 0 citations
Publisher

Abstract

A transverse ferromagnetic spin-1 system with a random single-ion anisotropy is considered in the framework of an Ising model.The effective field theory and decoupling approximation are applied to the derivation of the expressions of magnetizations for a honeycomb lattice.Special emphasis is placed on the critical properties of the system.New critical properties are obtained in a certain range of single-ion anisotropy,random concentration,and transverse field.We discuss in detail the influence of the random concentration and transverse field on the critical properties.Some phenomena have not been discovered in previous reports.Detailed descriptions of the phase transition and magnetization curves are presented.

DOI
10.1088/1009-1963/11/4/013

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A transverse ferromagnetic spin-1 system with a random single-ion anisotropy is considered in the framework of an Ising model.The effective field theory and decoupling approximation are applied to the derivation of the expressions of magnetizations for a honeycomb lattice.Special emphasis is placed on the critical properties of the system.New critical properties are obtained in a certain range of single-ion anisotropy,random concentration,and transverse field.We discuss in detail the influence of the random concentration and transverse field on the critical properties.Some phenomena have not been discovered in previous reports.Detailed descriptions of the phase transition and magnetization curves are presented.
A transverse ferromagnetic spin-1 system with a random single-ion anisotropy is considered in the framework of an Ising model. The effective field theory and decoupling approximation are applied to the derivation of the expressions of magnetizations for a honeycomb lattice. Special emphasis is placed on the critical properties of the system. New critical properties are obtained in a certain range of single-ion anisotropy, random concentration and transverse field. We discuss in detail the influence of the random concentration and transverse field on the critical properties. Some phenomena have not been discovered in previous reports. Detailed descriptions of the phase transition and magnetization curves are presented.
The critical properties of the bond-diluted mixed spin-1/2 and spin-1 transverse Ising system with single-ion anisotropy are investigated by means of the effective field theory with correlations. Particular emphasis is given to the square lattice for which phase diagrams are obtained. If transverse field varies in the certain ranges we find that the tricritical point is obtained for the value of the bond concentration in a restricted region. We also observe that the reentrant phase transition may occur in the present system if single-ion anisotropy parameter is not large and if transverse field is small. On the other hand, for certain values of the system parameters, new induced magnetic ordering can be obtained. We find a number of interesting phenomena that are not predicted by previous literatures. The influence of the transverse field on the behaviours of the reentrant phase transition and induced magnetic ordering is discussed. A detailed description of the phase transition is presented.
In the light of the effective-field theory, the present paper attempts to discuss the investigation done into the phase diagrams of a random nearest-neighbour interaction spin-1 Ising model with a single-ion anisotropy in an applied transverse field on the honeycomb lattice. The interactions are assumed to be independent random variables with distribution P(J ij )=p delta (J ij -J 1 )+(1-p) delta (J ij -J 2 ), where J 1 >0and mod J 2 /J 1 mod <or=1. We find a number of interesting phenomena, such as two different types of re-entrant phenomenon due to the competition between the random bond and the negative single-ion anisotropy parameter, as well as the usual frustration of J ij . The influence of a transverse field on the behaviours of the tricritical point and re-entrant transition is also discussed in this paper.
We study the thermodynamic properties of random transverse field mixed spin system in the presence of single-ion anisotropy on a square lattice. By making use of the effective field theory and a cutting approximation, the detailed phase diagrams are described and some interesting results are found under trimodal random transverse field distribution. A small single-ion anisotropy can magnify magnetic ordering region at low temperatures and existence of a large transverse field can assist the occurrence of reentrant phenomena. With increasing disorder, second-order phase transitions are shown to change into first-order phase transitions. The trajectory of the tricritical point in the phase space as a function of disorder is presented. These indicate a strong correlation with the corresponding to trimodal transverse field distribution.
We study the thermodynamic properties of random transverse field mixed spin system in the presence of single-ion anisotropy on a square lattice. By making use of the effective field theory and a cutting approximation, the detailed phase diagrams are described and some interesting results are found under trimodal random transverse field distribution. A small single-ion anisotropy can magnify magnetic ordering region at low temperatures and existence of a large transverse field can assist the occurrence of reentrant phenomena. With increasing disorder, second-order phase transitions are shown to change into first-order phase transitions. The trajectory of the tricritical point in the phase space as a function of disorder is presented. These indicate a strong correlation with the corresponding to trimodal transverse field distribution.
Within the framework of an effective field approximation, the effects of single-ion anisotropy and different trimodal transverse fields of two sublattices on the critical properties of the mixed spin-1/2 and spin-1 Ising system are investigated on the simple cubic lattice. A smaller single-ion anisotropy can magnify magnetic ordering phases and a larger one can depress magnetic ordering phase for T -Ω 1/2 space at low temperatures, while a smaller single-ion anisotropy can hardly change the value of critical transverse field for T -Ω 1 space. On the other hand, influences of two different trimodal transverse fields concentrations on tricritical points and magnetic ordering phases take on some interesting results in T - D space. The main reason comes from the common action of single-ion anisotropy, different transverse fields and two trimodal distributions.