Magnetism and superconductivity of new heavy fermion compounds CeTIn5 (T=Co, Rh and Ir) are investigated by applying fluctuation exchange approximation to an orbital degenerate Hubbard model. The superconducting phase with dx2−y2-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.
@article{arxiv.cond-mat/0212467,
title = {Superconductivity in the Orbital Degenerate Model for Heavy Fermion Systems},
author = {Tetsuya Takimoto and Takashi Hotta and Kazuo Ueda},
journal= {arXiv preprint arXiv:cond-mat/0212467},
year = {2009}
}