High Temperature Superconductivity in Transition Metal Oxypnictides: a Rare-Earth Puzzle - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: We have performed an extensive ab initio LDA and LSDA+U calculations ofelectronic structure of newly discovered high-temperature superconductingseries ReO1-xFxFeAs Re=La,Ce, Pr, Nd, Sm and hypothetical case of Re=Y.In all cases we obtain almost identical electronic spectrum both energydispersions and the densities of states in rather wide energy interval about2 eV around the Fermi level. We also debate that this fact is unlikely to bechanged by the account of strong correlations. It leads inevitably to the samecritical temperature Tc of superconducting transition in any theoreticalBCS-like mechanism of Cooper pair formation. We argue that the experimentallyobserved variations of Tc for different rare-earth substitutions are either dueto disorder effects or less probably because of possible changes inspin-fluctuation spectrum of FeAs layers caused by magnetic interactions withrare-earth spins in ReO layers.



Autor: I.A. Nekrasov, Z.V. Pchelkina, M.V. Sadovskii

Fuente: https://arxiv.org/







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