Orbital Selective Superconductivity in Two-Orbital Asymmetric t-J Models
Abstract
We present the zero-temperature superconducting (SC) ground states of the two-orbital asymmetric model on a square lattice by means of the auxiliary-boson approach. Besides the two-gap SC phase, we find an orbital selective SC (OSSC) phase, which is simultaneously SC in one orbit and normal in another orbit. The novel OSSC phase is stable only for sufficient asymmetric degree in orbital space and doping concentration. The pairing symmetry of the SC phase is s-wave-like in most doping regime, against the d-wave symmetry of the single-orbital model in a square lattice. The implication of the present scenario on multi-orbital heavy fermion and iron-based superconductors is also discussed.
Cite
@article{arxiv.0808.3809,
title = {Orbital Selective Superconductivity in Two-Orbital Asymmetric t-J Models},
author = {Feng Lu and Cui-Zhi Wang Wei-Hua Wang and Liang-Jian Zou},
journal= {arXiv preprint arXiv:0808.3809},
year = {2008}
}
Comments
4 figures, 7 pages, the 7th International Conference on Condensed Matters Theory and Computational Materials Science 12-16 July, 2008, Taiyuan, Shanxi, China