Phase diagram of spin- 1 2 quantum Heisenberg ^{J 1} - ^{J 2} antiferromagnet on the body-centered-cubic lattice in random phase approximation

Abstract

Magnetic properties of spin 12J1-J2 Heisenberg antiferromagnet on the body centered cubic lattice are investigated. By using two-time temperature Green's functions, sublattice magnetization and critical temperature depending on the frustration ratio p=J2/J1 are obtained in both stripe and Néel phases. The analysis of ground state sublattice magnetization and phase diagram indicates the critical end point at J2/J1=0.714, in agreement with previous studies. © 2013 Elsevier Ltd.