Fermi surface evolution and checker-board block-spin antiferromagnetism in FeSe
arXiv:1204.5768 · doi:10.1103/PhysRevB.86.134512
Abstract
We develop an effective multiorbital mean-field t-J Hamiltonian with realistic tight-binding and exchange parameters to describe the electronic and magnetic structures of iron-selenide based superconductors FeSe for iron vacancy doping in the range . The Fermi surface topology extracted from the spectral function of angle-resolved photoemission spectroscopy (ARPES) experiments is adequately accounted for by a tight-binding lattice model with random vacancy disorder. Since introducing iron vacancies breaks the lattice periodicity of the stochiometric compound, it greatly affects the electronic band structure. With changing vacancy concentration the electronic band structure evolves, leading to a reconstruction of the Fermi surface topology. For intermediate doping levels, the realized stable electronic structure is a compromise between the solutions for the perfect lattice with and the vacancy stripe-ordered lattice with , which results in a competition between vacancy random disorder and vacancy stripe order. A multiorbital hopping model is parameterized by fitting Fermi surface topologies to ARPES experiments, from which we construct a mean-field t-J lattice model to study the paramagnetic and antiferromagnetic (AFM) phases of KFeSe. In the AFM phase the calculated spin magnetization of the t-J model leads to a checker-board block-spin structure in good agreement with neutron scattering experiments and {\it ab}-{\it initio} calculations.
arXiv comment8 pages, 7 figures
References in corpus (43)
- Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
- Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
- Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
- Fe-based high temperature superconductivity with Tc=31K bordering an insulating antiferromagnet in (Tl,K)FexSe2 Crystals
- Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
- A Novel Large Moment Antiferromagnetic Order in K0.8Fe1.6Se2 Superconductor
- Fermi surface nesting induced strong pairing in iron-based superconductors
- Synthesis and crystal growth of Cs0.8(FeSe0.98)2: a new iron-based superconductor with Tc=27K
- Competition and coexistence of antiferromagnetism and superconductivity in underdoped Ba(Fe0.953Co0.047)2As2
- Microstructure and Fe-vacancy ordering in the KFexSe2 superconducting system
- Common Crystalline and Magnetic Structure of superconducting A2Fe4Se5
- Distinct Fermi Surface Topology and Nodeless Superconducting Gap in (Tl0.58Rb0.42)Fe1.72Se2 Superconductor
- Iron pnictides as a new setting for quantum criticality
- Electronic identification of the actual parental phase of KxFe2-ySe2 superconductor and its intrinsic mesoscopic phase separation
- Superconductivity at 32K and anisotropy in Tl0.58Rb0.42Fe1.72Se2 crystals
- The effect of varying Fe-content on transport properties of K intercalated iron selenide KxFe2-ySe2
- Strong nodeless pairing on separate electron Fermi surface sheets in (Tl, K)FeSe probed by ARPES
- Electronic structure of heavily electron-doped BaFeCoAs studied by angle-resolved photoemission
- Nanoscale phase separation of antiferromagnetic order and superconductivity in KFeSe
- Electronic structures and magnetic orders of Fe-vacancies ordered ternary iron selenides TlFeSe and AFeSe (A=K, Rb, or Cs)
- Iron vacancy superstructure and possible room temperature antiferromagnetic order in superconducting Cs_{y}Fe_{2-x}Se_2
- Mott transition in Modulated Lattices and Parent Insulator of (K,Tl)yFexSe2 Superconductors
- Angle-resolved photoemission evidence of s-wave superconducting gap in KxFe2-ySe2 superconductor
- Nonmagnetic Impurity Resonances as a Signature of Sign-Reversal Pairing in the FeAs-based Superconductors
- Block Spin Ground State and 3-Dimensionality of (K,Tl)FeSe
- Correlation effects in the iron pnictides
- Symmetric Microscopic Model for Iron-Based Superconductors
- Electronic and magnetic structures of ternary iron selenides AFeSe (A=K, Cs, or Tl)
- Electronic structure and Fermi surface of new K intercalated iron selenide superconductor KxFe2Se2
- Theory for superconductivity in (Tl,K)FeSe as a doped Mott insulator
- Antiferromagnetic order and superlattice structure in nonsuperconducting and superconducting RbyFe(1.6+x)Se2
- Effective doping and suppression of Fermi surface reconstruction via Fe vacancy disorder in KxFe2-ySe2
- Electronic Structure, Topological Phase Transitions and Superconductivity in (K,Cs)xFe2Se2
- Electronic Structure of KFeSe from First Principles Calculations
- Density Functional Study of the Over-Doped Iron Chalcogenide: TlFeSe with ThCrSi structure
- Superconductivity in Multi-orbital t-J1-J2 Model and its Implications for Iron Pnictides
- Vortex states in hole-doped iron-pnictide superconductors
- Block Antiferromagnetism and Checkerboard Charge Ordering in Alkali-doped Iron Selenides FeSe
- Spin-Density-Wave and Asymmetry of Coherence Peaks in iron-Pnictide Superconductors from a two-orbital model
- Electronic Structure and Mott Localization in Iron Deficient TlFeSe with Superstructures
- Modulated superconductivity due to vacancy and magnetic order in FeSe [Cs, K, (Tl,Rb), (Tl,K)] iron-selenide superconductors
- Local Electronic Structure around a Single Impurity as a Test of Pairing Symmetry in (K,Tl)FeSe Superconductors
- Spin dynamics in electron-doped pnictide superconductors