Kondo Effect in the Presence of Spin--Orbit Coupling
スポンサーリンク
概要
- 論文の詳細を見る
Recently, a series of noncentrosymmetric superconductors has been a subject of considerable interest since the discovery of superconductivity in CePt3Si. In noncentrosymmetric materials, the degeneracy of bands is lifted in the presence of spin--orbit coupling. This will bring about new effects in the Kondo effect since the band degeneracy plays an important role in the scattering of electrons by localized spins. We investigate the single-impurity Kondo problem in the presence of spin--orbit coupling. We examine the effect of spin--orbit coupling on the scattering of conduction electrons, by using the Green's function method, for the s--d Hamiltonian, with employing a decoupling procedure. As a result, we obtain a closed system of equations of Green's functions, from which we can calculate physical quantities. The Kondo temperature T_{\text{K}} is estimated from a singularity of Green's functions. We show that T_{\text{K}} is reduced as the spin--orbit coupling constant \alpha is increased. When 2\alpha k_{\text{F}} is comparable to or greater than k_{\text{B}}T_{\text{K}}(\alpha=0), T_{\text{K}} shows an abrupt decrease as a result of the band splitting. This suggests a Kondo collapse accompanied with a sharp decrease of T_{\text{K}}. The \log T-dependence of the resistivity will be concealed by the spin--orbit interaction.
- 2012-09-15
著者
-
Yanagisawa Takashi
Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, Tsukuba, Ibaraki 305-8568, Japan
-
Yanagisawa Takashi
Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
-
Yanagisawa Takashi
Electronics and Photonics Research Institute, AIST, Central 2, Tsukuba, Ibaraki 305-8568, Japan
関連論文
- Fermi Surface and de Haas-van Alphen Oscillation in both the Normal and Superconducting Mixed States of UPd_2Al_3
- Superconducting Condensation Energy of the Two-Chain Hubbard Model in the Bulk Limit : Condensed Matter: Electronic Properties, etc.
- Effect of the Medium-Range Transfer Energies to the Superconductivity in the Two-Chain Hubbard Model
- Off-Diagonal Wave Function Monte Carlo Studies of Hubbard Model I.
- Superconducting Phase Diagram of the Two-Band Model Investigated by the Exact-Diagonalization Method
- Variational Monte Carlo Indications of d-Wave Superconductivity in the Two-Dimensional Hubbard Model
- d-Wave State with Multiplicative Correlation Factors for the Hubbard Model
- Superconducting Condensation Energy of the Two-Dimensional Hubbard Model in the Large-Negative-t' Region
- Unrestricted Hartree-Fock Analysis of Sr-xCa[x]RuO
- Ground State and Staggered Susceptibility of the Two-Impurity Problem
- Vortices and Chirality in Multi-Band Superconductors
- Kondo Effect in the Presence of Spin--Orbit Coupling
- Massless Modes and Abelian Gauge Fields in Multi-Band Superconductors