Zero temperature phases of the frustrated J1-J2 antiferromagnetic spin-1/2 Heisenberg model on a simple cubic lattice

Kingshuk Majumdar, Trinanjan Datta

Research output: Contribution to journalArticle

14 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)714-726
Number of pages13
JournalJournal of Statistical Physics
Volume139
Issue number4
DOIs
StatePublished - May 1 2010

Keywords

  • Frustrated magnetic spin systems
  • Heisenberg spin systems
  • Magnetism
  • Quantum phase transition

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics

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