科研之友
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摘要
A mean-field treatment is presented of a square lattice two-orbital-model for BiS2 taking into account intra- and inter-orbital superconductivity. A rich phase diagram involving both types of superconductivity is presented as a function of the ratio between the couplings of electrons in the same and different orbitals (eta = V-XX/V-XY) and electron doping x. With the help of a quantity we call orbital-mixing ratio, denoted as R(phi), the phase diagram is analyzed using a simple and intuitive picture based on how R(phi) varies as electron doping increases. The predictive power of R(phi) suggests that it could be a useful tool in qualitatively (or even semi-quantitatively) analyzing multiband superconductivity in BCS-like superconductors.
- 出版日期2017-8-2
