Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 91: Superconductivity: (General) Theory 1

TT 91.1: Talk

Thursday, March 19, 2015, 11:30–11:45, H 2053

Ab initio study of the interplay between superconductivity and magnetic fields in MgB₂ — •Alexandros Aperis, Pablo Maldonado, and Peter M. Oppeneer — Uppsala University, Uppsala, Sweden

Among the bulk superconductors broadly accepted to be mediated by phonons, MgB₂ exhibits a record high critical temperature of T_c=39 K. The relatively simple crystal structure of this material makes it an ideal platform to investigate fundamental phenomena, such as the interplay between superconductivity and the Zeeman effect, at the ab initio level. Here we combine DFT calculations providing electronic band and phonon dispersions with numerical solutions of the fully anisotropic Eliashberg equations, to provide a complete picture of the modification of the two-band superconductivity in this compound at finite external magnetic fields and temperature. We predict interesting signatures in the H − T phase diagram which could be experimentally probed.