Ensemble inequivalence in the Blume-Emery-Griffiths model near a fourth-order critical point

被引：20

作者：

Prasad, V. V. ^{[1
]}

Campa, Alessandro ^{[2
]}

Mukamel, David ^{[1
]}

Ruffo, Stefano ^{[3
,4
]}

机构：

[1] Weizmann Inst Sci, Dept Phys Complex Syst, IL-7610001 Rehovot, Israel

[2] Ist Super Sanita, Natl Ctr Radiat Protect & Computat Phys, Viale Regina Elena 299, I-00161 Rome, Italy

[3] INFN, SISSA, Via Bonomea 265, I-34136 Trieste, Italy

[4] CNR, ISC, Via Bonomea 265, I-34136 Trieste, Italy

来源：

PHYSICAL REVIEW E | 2019年 / 100卷 / 05期

关键词：

STATISTICAL-MECHANICS; ISING-MODEL; 2-DIMENSIONAL VORTICES; TRICRITICAL POINTS; DYNAMICS;

D O I：

10.1103/PhysRevE.100.052135

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The canonical phase diagram of the Blume-Emery-Griffiths model with infinite-range interactions is known to exhibit a fourth-order critical point at some negative value of the biquadratic interaction K < 0. Here we study the microcanonical phase diagram of this model for K < 0, extending previous studies which were restricted to positive K. A fourth-order critical point is found to exist at coupling parameters which are different from those of the canonical ensemble. The microcanonical phase diagram of the model close to the fourth-order critical point is studied in detail revealing some distinct features from the canonical counterpart.

引用

页数：9

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