Effect of Anharmonicity on the Kondo Phenomena of a Magnetic Ion Vibrating in a Confinement Potential
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概要
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Effect of anharmonicity of a cage potential for a magnetic ion vibrating in a metal is investigated by the numerical renormalization group method. The cage potential is assumed to be one-dimensional and of the double-well type. In the absence of the Coulomb interaction, we find continuous crossover among the three limiting cases: Yu--Anderson-type Kondo regime, the double-well-type Kondo one, and the renormalized Fermi chain one. In the entire parameter space of the double-well potential, the ground state is described by a local Fermi liquid. In the Yu--Anderson-type Kondo regime, a quantum phase transition to the ground state with odd parity takes place passing through the two-channel Kondo fixed point when the Coulomb interaction increases. Therefore, the vibration of a magnetic ion in an oversized cage structure is a promising route to the two-channel Kondo effect.
- 2011-08-15
著者
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Ueda Kazuo
Institiute For Solid State Physics University Of Tokyo
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Yashiki Satoshi
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Ueda Kazuo
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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