Open AccessThermodynamic properties of random transverse mixed Ising spin system with cryst al field
Author(s) -
Yanan Zhang,
Yan Shi-Lei
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.2890
Subject(s) - ising model , condensed matter physics , field (mathematics) , transverse plane , percolation (cognitive psychology) , random field , transverse field , physics , effective field theory , phase diagram , phase transition , percolation threshold , statistical physics , reentrancy , phase (matter) , quantum mechanics , mathematics , statistics , structural engineering , neuroscience , pure mathematics , engineering , electrical resistivity and conductivity , biology
Making use of the effective field theory (EFT) and a cutting approximation, in the framework of Ising model, we investigate the thermodynamic properties of a random transverse mixed spin system with a crystal field. Special emphasis is placed on the influence of crystal field, transverse field and random concentration on phase transitions of the system. Our studies find that a smaller crystal field cannot change the percolation threshold of the critical transverse field in the presence of a random transverse field, and that the reentrant phenomena shall appear in the range of random concentration concerned when the transverse field takes a larger value, where as the reentrant phenomena do not occur and when the transverse field takes a smaller value. These new thermodynamic properties have not been reported in previous works so far as we know. We give a series of pha se diagrams and discuss them in detail.