Effects of a Magnetic Field on Superconductivity and Quantum Criticality in Quasi-Two-Dimensional Systems with Dirac Electrons
arXiv:2010.02513 · doi:10.1016/j.physb.2007.10.087
Abstract
We study the effects of an external magnetic field on thensuperconducting phase diagram of a quasi-two-dimensional system of Dirac electrons at an arbitrary temperature. At zero temperature, there is a quantum phase transition connecting a normal and a superconducting phase, occurring at a critical line that corresponds to a magnetic field dependent critical coupling parameter, which should be observed in planar materials containing Dirac electrons, such as . Moreover, the superconducting gap is obtained as a function of temperature, magnetic field and coupling parameter (). From this, we extract the critical magnetic field as a function of the temperature. For small values of , we obtain a linear decay of the critical field, which is similar to the behavior observed experimentally in the copper doped dichalcogenide and also in intercalated graphite.
arXiv admin note: substantial text overlap with arXiv:cond-mat/0703184