Journal of Statistical Physics

, Volume 139, Issue 4, pp 714–726

Zero Temperature Phases of the Frustrated J1J2 Antiferromagnetic Spin-1/2 Heisenberg Model on a Simple Cubic Lattice

Authors

    • Department of PhysicsGrand Valley State University
  • Trinanjan Datta
    • Department of Chemistry and PhysicsAugusta State University
Article

DOI: 10.1007/s10955-010-9967-y

Cite this article as:
Majumdar, K. & Datta, T. J Stat Phys (2010) 139: 714. doi:10.1007/s10955-010-9967-y

Abstract

At zero temperature magnetic phases of the quantum spin-1/2 Heisenberg antiferromagnet on a simple cubic lattice with competing first and second neighbor exchanges (J1 and J2) is investigated using the non-linear spin wave theory. We find existence of two phases: a two sublattice Néel phase for small J2 (AF), and a collinear antiferromagnetic phase at large J2 (CAF). We obtain the sublattice magnetizations and ground state energies for the two phases and find that there exists a first order phase transition from the AF-phase to the CAF-phase at the critical transition point, pc=0.56 or J2/J1=0.28. We also show that the quartic 1/S corrections due spin-wave interactions enhance the sublattice magnetization in both the phases which causes the intermediate paramagnetic phase predicted from linear spin wave theory to disappear.

Keywords

MagnetismFrustrated magnetic spin systemsQuantum phase transitionHeisenberg spin systems

Copyright information

© Springer Science+Business Media, LLC 2010