Thermodynamics of the anisotropic two-channel Kondo problem

Article

关键词: DEGENERATE ELECTRON-GAS;    FERMI-LIQUID BEHAVIOR;    2-LEVEL SYSTEM;    AMORPHOUS METALS;    MODEL;    UNIVERSALITY;    TEMPERATURE;    ENERGY;    POINT;    FIELD;   

DOI  :  10.1103/PhysRevB.65.134416

来源: SCIE

【 摘 要 】

We construct and solve numerically the thermodynamic Bethe-ansatz equations for the spin-anisotropic two-channel Kondo model in arbitrary external field h. At high temperatures the specific heat and the susceptibility show power-law dependence. For h-->0 and at temperatures below the Kondo temperature T-K a two-channel Kondo effect develops characterized by a Wilson ratio 8/3, and a logarithmic divergence of the susceptibility and the linear specific-heat coefficient. A finite magnetic field, h>0, drives the system to a Fermi-liquid fixed point with an unusual Wilson ratio which depends sensitively on h.

【 授权许可】

Free