Magnetic state of K0.8Fe1.6Se2 from a five-orbital Hubbard model in the Hartree-Fock approximation
نویسندگان
چکیده
Qinlong Luo,1,2 Andrew Nicholson,1,2 José Riera,3 Dao-Xin Yao,4 Adriana Moreo,1,2 and Elbio Dagotto1,2 1Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3Instituto de Fı́sica Rosario, Universidad Nacional de Rosario, 2000-Rosario, Argentina 4State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China (Received 22 August 2011; published 21 October 2011)
منابع مشابه
Slave - boson mean - field theory of spin - and orbital - ordered states in the degenerate Hubbard model ∗
The mean-field theory with the use of the slave-boson functional method is generalized to take account of the spinand orbital-ordered state in the doubly degenerate Hubbard model. Some numerical calculations are presented of the antiferromagnetic orbital-ordered state in the half-filled simple-cubic model. The orbital order in the present theory is much reduced compared with that in the Hartree...
متن کاملMagnetic states of the five-orbital Hubbard model for one-dimensional iron-based superconductors
The magnetic phase diagrams of models for quasi-one-dimensional compounds belonging to the ironbased-superconductor family are presented. The five-orbital Hubbard model and the real-space Hartree–Fock approximation are employed, supplemented by density functional theory to obtain the hopping amplitudes. Phase diagrams are constructed by varying the Hubbard U and Hund J couplings at zero tempera...
متن کاملSymmetry Classes of Spin and Orbital Ordered States in a t2g Hubbard Model on a Two-dimensional Squar Lattice
This paper presents symmetry classes of the Hartree-Fock (HF) solutions of spin and orbital ordered states in a t2g Hubbard model on a two-dimensional square lattice. Using a group theoretical bifurcation theory of the Hartree-Fock equation, we obtained many types of broken symmetry solutions which bifurcate from the normal state through one step transition in cases of commensurate ordering vec...
متن کامل2 2 Ju l 1 99 7 1 Slave - Boson Mean - Field Theory of the Antiferromagnetic State in the Doubly Degenerate Hubbard Model - The Half - Filled Case
The antiferromagnetic ground state of the half-filled Hubbard model with the doubly degenerate orbital has been studied by using the slave-boson mean-field theory which was previously proposed by the present author. Numerical calculations for the simple cubic model have shown that the metal-insulator transition does not take place except at the vanishing interaction point, in strong contrast wi...
متن کاملF eb 1 99 7 1 Slave - Boson Mean - Field Theory of the Antiferromagnetic State in the Doubly Degenerate Hubbard Model - The Half - Filled Case
The antiferromagnetic ground state of the half-filled Hubbard model with the doubly degenerate orbital has been studied by using the slave-boson mean-field theory which was previously proposed by the present author. Numerical calculations for the simple cubic model have shown that the metal-insulator transition does not take place except at the vanishing interaction point, in strong contrast wi...
متن کامل