Mean-Field Study of Charge Order with Long Periodicity in θ-(BEDT-TTF)_2X(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
スポンサーリンク
概要
- 論文の詳細を見る
Charge ordering phenomenon in θ-(BEDT-TTF)_2X is studied by using 1/4-filled extended Hubbard model on an anisotropic triangular lattice through mean-field approximation. It is found that a metallic charge ordered state with 3-periodicity on lattices (3-fold type charge order) is realized in the realistic parameter region where the nearest neighbor Coulomb interaction V_<ij> is nearly isotropic. This 3-fold state survives up to high temperatures by estimating the free energy. Insulating state with diagonal or verticaltype charge ordering appears as increasing anisotropy of V_<ij>. Considering the effect of the structural distortion observed in θ-(BEDT-TTF)_2RbZn(SCN)_4 at low temperatures, horizontal-type charge ordered insulating phase tends to be stabilized and the region where 3-fold type exists becomes narrower. Our results are consistent with the metallic state with long periodic charge order which can be related to 3-fold type in θ-(BEDT-TTF)_2RbZn(SCN)_4 at high temperatures and insulating state with horizontal charge order at low temperatures. For θ-(BEDT-TTF)_2CsZn(SCN)_4, we speculate several kinds of charge-ordered states are energetically competing with each other leading to an inhomogeneous state at low temperatures.
- 一般社団法人日本物理学会の論文
- 2006-01-15
著者
-
Kaneko Masato
Department Of Computer Science College Of Engineering Nihon University
-
Ogata Masao
Department Of Basic Science Graduate School Of Arts And Science University Of Tokyo
関連論文
- Numerical Study of Current-Induced Domain-Wall Dynamics : Crossover from Spin Transfer to Momentum Transfer(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Formation of Non-Unitary State near the Upper-Critical Field of Sr_2RuO_4(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Precise Control of Band Filling in Na_xCoO_2(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Human Herpesvirus 6 in Hematological Malignancies
- Fermi-Surface Reconstruction in the Periodic Anderson Model(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Normal-State Spin Dynamics of Five-Band Model for Iron Pnictides
- Quantum Monte Carlo Study of the Quasi-One-Dimensional Superconductivity(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- "Unscreening" Effect of Coulomb Interaction on Fe-Pnictide Superconductor(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Phase Diagram of the Triangular t-J Model with Multiple Spin Exchange in the Doped-Mott Region(Condensed matter: structure and mechanical and thermal properties)
- Mott Transitions and d-Wave Superconductivity in Half-Filled-Band Hubbard Model on Square Lattice with Geometric Frustration(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Variational Monte Carlo Studies of Pairing Symmetry for the t-J Model on a Triangular Lattice(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Superconductivity due to Charge Fluctuation in θ-Type Organic Conductors(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Superconductivity in Na_xCoO_2・yH_2O due to Charge Fluctuation (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Role of Spin-Orbit Coupling on the Spin Triplet Pairing in Na_xCoO_2・yH_2O II : Multiple Phase Diagram under the Magnetic Field(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Role of Spin-Orbit Coupling on the Spin Triplet Pairing in Na_xCoO_2・yH_2O : I. d-Vector under Zero Magnetic Field(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Ferromagnetic and Triplet-Pairing Instabilities Controlled by Trigonal Distortion of CoO_6 Octahedra in Na_xCoO_2・yH_2O(Condensed Matter : Structure, Mechanical and Thermal Properties)
- Multi-orbital Analysis on the Superconductivity in Na_xCoO_2・yH_2O(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
- Mean-Field Study of Charge Order with Long Periodicity in θ-(BEDT-TTF)_2X(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Brownian Motion of a Soliton in trans-Polyacetylene.I.Random Walk Mechanism
- Soliton-Phonon Interactions in trans-Polyacetylene
- Local Density of States near the Surface of a d+s-Wave Superconductor in the Two-Dimensional t-J Model : Condensed Matter: Electronic Properties, etc.
- Quasiparticle Properties around a Nonmagnetic Impurity in the Superconducting State of the Two-Dimensional t-J Model
- Drug-induced hypersensitivity syndrome due to carbapenem antibiotics
- Crossover of Superconducting Properties and Kinetic-Energy Gain in Two-Dimensional Hubbard Model (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Bilateral Ocular Adnexal Mucosa-Associated Lymphoid Tissue Lymphoma
- Novel Charge Order and Superconductivity in Two-Dimensional Frustrated Lattice at Quarter Filling(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Susceptibilities of Sr (Cu_Zn_x)_2O_3 Studied by Quantum Monte Carlo Simulation
- Coexistence of SDW and CDW in Quarter-Filled Organic Conductors
- Deformation of Electronic Structures Due to CoO_6 Distortion and Phase Diagrams of Na_xCoO_2・yH_2O(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Development of Superconducting Correlation at Low Temperatures in the Two-dimensional t-J Model(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- High Pressure Effects on the Quantum Tunneling of Magnetization in Mn_ Acetate
- Phase Diagram and Pairing Symmetry of the Two-Dimensional t-J Model by a Variation Theory
- Specific Heat and Superfluid Density for Possible Two Different Superconducting States in Na_xCoO_2・yH_2O(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Midgap States in Disordered Spin-Peierls Systems
- Coexistence of SDW and Purely-Electronic CDW in Quarter-Filled Organic Conductors
- Ferromagnetic Ising Spin Chains Emerging from the Spin Ice under Magnetic Field(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Increase of Superconducting Correlation due to Dimensionality Change in Quasi-One-Dimensional Conductors(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Brownian-Like Motion of a One-Dimensional φ^4 Kink and Fluctuation-Dissipation Theorem
- Coexistence of Charge Order and Spin-Peierls Lattice Distortion in One-Dimensional Organic Conductors
- Superconducting States in Frustrating t-J Model : A Model Connecting High-T_c Cuprates, Organic Conductors and Na_xCoO_2
- Rare Primary Effusion Lymphoma Associated with HHV-8 in Japan
- Charge Fluctuations in Geometrically Frustrated Charge Ordering System(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Theoretical Aspects of Charge Ordering in Molecular Conductors
- Harmonic Wavelet Analysis of Sound
- Charge-Fluctuation-Induced Superconducting State in Two-Dimensional Quarter-Filled Electron Systems (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Kinetic Energy, Condensation Energy, Optical Sum Rule and Pairing Mechanism in High-T_c Cuprates(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Theory of the Quasiparticle Spectra around a Vortex in the Two-Dimensional t-J Model
- Theory of Local Density of States of d_-Wave Superconducting State Near the Surfaces of the t-J Model
- Superconductivity and Antiferromagnetism in an Extended Gutzwiller Approximation for t-J Model : Effect of Double-Occupancy Exclusion
- Microscopic Identification of the D-vector in Triplet Superconductor Sr_2RuO_4
- Invasive Pulmonary Aspergillosis with Hematological Malignancy Caused by Aspergillus terreus and in vitro Susceptibility of A. terreus Isolate to Micafungin
- Single-Impurity Problem in Iron-Pnictide Superconductors
- Three-Dimensional Dirac Electrons at the Fermi Energy in Cubic Inverse Perovskites: Ca3PbO and Its Family
- Effects of Charge Density Modulation on Incommensurate Antiferromagnetism:Ginzburg-Landau Study
- Successful Treatment of Refractory Enteropathy-Associated T-Cell Lymphoma Using High-Dose Chemotherapy and Autologous Stem Cell Transplantation
- Spin-Hall Effect and Diamagnetism of Dirac Electrons
- Ferromagnetism on the Frustrated Lattices (Condensed Matter: Electric Structure, Electrical, Magnetic and Optical Properties)
- Theory of Mechanism of \pi--d Interaction in Iron--Phthalocyanine
- Recent Topics of Organic Superconductors
- Crossover between BCS Superconductor and Doped Mott Insulator of d-Wave Pairing State in Two-Dimensional Hubbard Model
- Spin-Polarization in Magneto-Optical Conductivity of Dirac Electrons
- Momentum Transfer between a Kink and a Phonon in the One-Dimensional φ^4System
- Magnetic Conversion Induced by Non-Magnetic Impurities in a Molecular Spin Ladder System, p-EPYNN·[Ni(dmit)2]
- Simple Real-Space Picture of Nodeless and Nodal $s$-Wave Gap Functions in Iron Pnictide Superconductors
- Thermoelectric Transport Coefficients for Massless Dirac Electrons in Quantum Limit
- Mean-Field Analysis of Electric Field Effect on Charge Orders in Organic Conductors
- Spectral Functions of One-Dimensional Electron Systems with Ising-Like Spin Gap
- Viscosity of a Kink in the One-Dimensional φ^4 System
- Mean-Field Study of Charge Order with Long Periodicity in θ-(BEDT-TTF)_2X(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)