Electronic and magnetic structures of the ternary iron selenides AFe2Se2 (A=Cs, Rb, K, or Tl)
- 3 August 2011
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 84 (5)
- https://doi.org/10.1103/physrevb.84.054502
Abstract
We have studied the electronic and magnetic structures of the ternary iron selenides FeSe ( Cs, Rb, K, or Tl) using first-principles electronic structure calculations. We find that the ground state of these compounds is bicollinearly antiferromagnetically ordered, with the Fe moments having collinear antiferromagnetic order in each bipartite sublattice. This bicollinear antiferromagnetic order results from the superexchange interactions of Fe moments mediated by the Se orbitals. We have also determined the density of states at the Fermi level, the specific heat coefficient, the Pauli susceptibility, and other related physical properties in both the nonmagnetic and bicollinear antiferromagnetic states for these compounds. The underlying mechanism is discussed according to the electronic structure analysis. DOI: http://dx.doi.org/10.1103/PhysRevB.84.054502 ©2011 American Physical Society
Keywords
This publication has 18 references indexed in Scilit:
- Fe-based superconductivity with T c =31 K bordering an antiferromagnetic insulator in (Tl,K) Fe x Se 2Europhysics Letters, 2011
- Superconductivity at 32 K in single-crystalline RbFeSePhysical Review B, 2011
- Synthesis and crystal growth of Cs0.8(FeSe0.98)2: a new iron-based superconductor withTc= 27 KJournal of Physics: Condensed Matter, 2011
- Superconductivity in the iron selenidePhysical Review B, 2010
- First-Principles Calculations of the Electronic Structure of Tetragonal-FeTe and-FeSe Crystals: Evidence for a Bicollinear Antiferromagnetic OrderPhysical Review Letters, 2009
- First-order magnetic and structural phase transitions inPhysical Review B, 2009
- Superconductivity at 38 K in the Iron ArsenidePhysical Review Letters, 2008
- Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 KJournal of the American Chemical Society, 2008
- Generalized Gradient Approximation Made SimplePhysical Review Letters, 1996
- Soft self-consistent pseudopotentials in a generalized eigenvalue formalismPhysical Review B, 1990