First-principles prediction of spin-density-reflection symmetry driven magnetic transition of CsCl-type FeSe

Gul Rahman, In Gee Kim, Arthur J. Freeman

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Based on results of density functional theory (DFT) calculations with the local spin density approximation (LSDA) and the generalized gradient approximation (GGA), we propose a new magnetic material, CsCl-type FeSe. The calculations reveal the existence of ferromagnetic (FM) and antiferromagnetic (AFM) states over a wide range of lattice constants. At 3.12 in the GGA, the equilibrium state is found to be AFM with a local Fe magnetic moment of ±2.69μB. A metastable FM state with Fe and Se local magnetic moments of 2.00 and -0.032μB, respectively, lies 171.7 meV above the AFM state. Its equilibrium lattice constant is ∼2% smaller than that of the AFM state, implying that when the system undergoes a phase transition from the AFM state to the FM one, the transition is accompanied by volume contraction. Such an AFMFM transition is attributed to spin-density z-reflection symmetry; the symmetry driven AFMFM transition is not altered by spinorbit coupling. The relative stability of different magnetic phases is discussed in terms of the local density of states. We find that CsCl-type FeSe is mechanically stable, but the magnetic states are expected to be brittle.

Original languageEnglish
Pages (from-to)3153-3158
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume322
Issue number20
DOIs
Publication statusPublished - Oct 1 2010

Keywords

  • CsCl-type FeSe
  • Electronic structure
  • First-order magnetic transition
  • First-principles calculations
  • Mechanical stability
  • Spin-density-reflection symmetry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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