Superconductivity in the Orbital Degenerate Model for Heavy Fermion Systems

Details Superconductivity in the Orbital Degenerate Model for Heavy Fermion Systems Superconductivity in the Orbital Degenerate Model for Heavy Fermion Systems

2002-12-19

arxiv.org/abs/cond-mat/0212467v1

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures

Scientific paper

10.1088/0953-8984/15/28/329

Magnetism and superconductivity of new heavy fermion compounds CeTIn$_5$ (T=Co, Rh and Ir) are investigated by applying fluctuation exchange approximation to an orbital degenerate Hubbard model. The superconducting phase with $d_{x^2-y^2}$-symmetry is found to appear next to the antiferromagnetic phase with increasing the orbital splitting energy. The present theory suggests that the orbital splitting energy plays a key role of controlling parameter for the quantum phase transitions in the heavy fermion system.

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