High-temperature expansion for frustrated magnets: Application to the J1-J2 model on the BCC lattice

被引：18

作者：

Richter, Johannes ^{[1
]}

Mueller, Patrick ^{[1
]}

Lohmann, Andre ^{[1
]}

Schmidt, Heinz-Juergen ^{[2
]}

机构：

[1] Univ Magdeburg, Inst Theoret Phys, D-39016 Magdeburg, Germany

[2] Univ Osnabruck, Dept Phys, Osnabruck, Germany

来源：

20TH INTERNATIONAL CONFERENCE ON MAGNETISM, ICM 2015 | 2015年 / 75卷

关键词：

quantum magnetism; frustration; structure factor; high-temperature expansion; HEISENBERG-ANTIFERROMAGNET; CRITICAL EXPONENTS; SQUARE LATTICE; PHASE-DIAGRAM; MONTE-CARLO;

D O I：

10.1016/j.phpro.2015.12.105

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present the high-temperature expansion up to 11th order for the specific heat C and the uniform susceptibility chi(0) and up to 9th order for the structure factor S-Q of the frustrated spin-half J(1)-J(2) Heisenberg model on the BCC lattice. We consider ferromagnetic as well as antiferromagnetic nearest-neighbor exchange J(1) and frustrating antiferromagnetic next-nearest-neighbor exchange J(2). We discuss the influence of frustration on the temperature dependence of these quantities. Furthermore, we use the HTE series to determine the critical temperature T-c as a function of the frustration parameter J(2).

引用

页码：813 / 820

页数：8

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