Anomalous Magnetoresistance in a Spin-Fermion Model with Quantum Fluctuation(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
Electron transport is investigated theoretically for an electron which is coupled to a localized spin system. The dc electrical conductivity of spin-fermion models in one dimension is studied by the direct numerical estimation of the Kubo formula. The dependence of the conductivity on temperature and external magnetic field is investigated. When the localized spins are antiferromagnetically coupled on a chain, the conductivity shows a monotonic increase with magnetic field, which is ordinary magnetoresistance. However, in a system where the localized spins form an antiferromagnetically coupled two-leg ladder, the conductivity shows an anomalous non-monotonic field dependence. Analysis of the spin configuration of the localized spin system reveals that quantum fluctuation determines the conductivity through a dimerized-rung spin configuration, and the formation of local triplets on the ladder rungs causes the decrease in conductivity.
- 社団法人日本物理学会の論文
- 2004-06-15
著者
-
KUSAKABE Koichi
Department of Material Engineering Science, Graduate School of Engineering Science, Osaka University
-
OGASAHARA Akira
Department of Applied Physics, University of Tokyo
-
Ogasahara Akira
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
-
Ogasahara Akira
Department Of Applied Physics Graduate School Of Engineering University Of Tokyo
-
Kusakabe Koichi
Department Of Material Engineering Science Graduate School Of Engineering Science Osaka University
-
Kusakabe Koichi
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
-
Kusakabe Koichi
Department of Applied Physics and Chemistry, The University of Electro-Communications
関連論文
- Scaling Relation for Excitation Energy under Hyperbolic Deformation(General and Mathematical Physics)
- Low Dimensionality Observed by ESR Measurements in S = 1 Spin Ladder Substance BIP-TENO (3,3',5,5'-tetrakis(N-tert-butylaminoxyl)biphenyl)(Condensed Matter : Electronic Strucuture, Electrical, Magnetic and Optical Properties)
- Frequency Dependence of Electron Spin Resonance
- Direct Calculation of Dynamical Susceptibility in Strongly Fluctuating Quantum Spin Systems
- Anomalous Magnetoresistance in a Spin-Fermion Model with Quantum Fluctuation(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Effects of Dzyaloshinsky-Moriya Interaction on ESR of Shastry-Sutherland Model
- Effects of Dzyaloshinsky-Moriya Interaction on ESR of Shastry-Sutherland Model
- Hyperbolic deformation applied to S = 1 spin chains: scaling relation in excitation energy
- A Complete Set of Spin 1/2 Functions by Young's Diagrams
- Recent Development of Multireference Density Functional Theory
- High-Spin States in the Hubbard Model : Generalized Hund's Coupling and a Crossover to Strong U Regime
- Two-Site Shift Product Wave Function Renormalization Group Method Applied to Quantum Systems(General)
- ESR of Antiferromagnetic Cluster : Condensed Matter: Electronic Properties, etc.
- Hyperbolic Deformation Applied to S = 1 Spin Chains --- Scaling Relation in Excitation Energy ---