Recent angle-resolved photoemission spectroscopy measurements of CaKFe4As 4 report the presence of four superconductive gaps on different sheets of Fermi surface. The interesting aspect of this supercon- ductor is that it is stoichiometric and with a high critical temperature. I show that the phenomenology of this superconductor can be explained in the framework of four-band s ±-wave Eliashberg theory choosing antiferromagnetic spin fluctuations as pairing glue. In particular, various experimental data reported in literature: the energy gaps, the critical temperature, the temperature dependence of the upper critical field, the penetration depth and the thermopower can be reproduced by this model in a strong-coupling regime with a small number of free parameters.
Phenomenology of CaKFe4As4 explained in the framework of four bands Eliashberg theory / Ummarino, Giovanni. - In: PHYSICA. C, SUPERCONDUCTIVITY. - ISSN 0921-4534. - ELETTRONICO. - 529:(2016), pp. 50-53. [10.1016/j.physc.2016.09.002]
Phenomenology of CaKFe4As4 explained in the framework of four bands Eliashberg theory
UMMARINO, Giovanni
2016
Abstract
Recent angle-resolved photoemission spectroscopy measurements of CaKFe4As 4 report the presence of four superconductive gaps on different sheets of Fermi surface. The interesting aspect of this supercon- ductor is that it is stoichiometric and with a high critical temperature. I show that the phenomenology of this superconductor can be explained in the framework of four-band s ±-wave Eliashberg theory choosing antiferromagnetic spin fluctuations as pairing glue. In particular, various experimental data reported in literature: the energy gaps, the critical temperature, the temperature dependence of the upper critical field, the penetration depth and the thermopower can be reproduced by this model in a strong-coupling regime with a small number of free parameters.Pubblicazioni consigliate
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https://hdl.handle.net/11583/2648887
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