Abstract
Cooper pairing between a conduction electron (c electron) and an f electron, referred to as the "c-f pairing," is examined to explain s-wave superconductivity in heavy-fermion systems. We first apply the Schrieffer-Wolff transformation to the periodic Anderson model assuming deep f level and strong Coulomb repulsion. The resulting effective Hamiltonian contains direct and spin-exchange interactions between c and f electrons, which are responsible for the formation of the c-f Cooper pairs. The mean-field analysis shows that the fully gapped c-f pairing phase with anisotropic s-wave symmetry appears in a large region of the phase diagram. We also find two different types of exotic c-f pairing phases, the Fulde-Ferrell and breached pairing phases. The formation of the c-f Cooper pairs is attributed to the fact that the strong Coulomb repulsion makes a quasiparticle f band near the center of the conduction band.
| Original language | English |
|---|---|
| Article number | 014516 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 87 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2013 Jan 31 |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Formation of Cooper pairs between conduction and localized electrons in heavy-fermion superconductors. / Masuda, Keisuke; Yamamoto, Daisuke.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 87, No. 1, 014516, 31.01.2013.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Formation of Cooper pairs between conduction and localized electrons in heavy-fermion superconductors
AU - Masuda, Keisuke
AU - Yamamoto, Daisuke
PY - 2013/1/31
Y1 - 2013/1/31
N2 - Cooper pairing between a conduction electron (c electron) and an f electron, referred to as the "c-f pairing," is examined to explain s-wave superconductivity in heavy-fermion systems. We first apply the Schrieffer-Wolff transformation to the periodic Anderson model assuming deep f level and strong Coulomb repulsion. The resulting effective Hamiltonian contains direct and spin-exchange interactions between c and f electrons, which are responsible for the formation of the c-f Cooper pairs. The mean-field analysis shows that the fully gapped c-f pairing phase with anisotropic s-wave symmetry appears in a large region of the phase diagram. We also find two different types of exotic c-f pairing phases, the Fulde-Ferrell and breached pairing phases. The formation of the c-f Cooper pairs is attributed to the fact that the strong Coulomb repulsion makes a quasiparticle f band near the center of the conduction band.
AB - Cooper pairing between a conduction electron (c electron) and an f electron, referred to as the "c-f pairing," is examined to explain s-wave superconductivity in heavy-fermion systems. We first apply the Schrieffer-Wolff transformation to the periodic Anderson model assuming deep f level and strong Coulomb repulsion. The resulting effective Hamiltonian contains direct and spin-exchange interactions between c and f electrons, which are responsible for the formation of the c-f Cooper pairs. The mean-field analysis shows that the fully gapped c-f pairing phase with anisotropic s-wave symmetry appears in a large region of the phase diagram. We also find two different types of exotic c-f pairing phases, the Fulde-Ferrell and breached pairing phases. The formation of the c-f Cooper pairs is attributed to the fact that the strong Coulomb repulsion makes a quasiparticle f band near the center of the conduction band.
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U2 - 10.1103/PhysRevB.87.014516
DO - 10.1103/PhysRevB.87.014516
M3 - Article
VL - 87
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 1
M1 - 014516
ER -