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- Title
High-temperature superconductivity in transition metal oxypnictides: A rare-earth puzzle?
- Authors
Nekrasov, I. A.; Pchelkina, Z. V.; Sadovskii, M. V.
- Abstract
Extensive ab initio LDA and LSDA + U calculations of an electronic structure of newly discovered high-temperature superconducting series ReO1 − x F x FeAs (Re = La, Ce, Pr, Nd, and Sm and the hypothetical case of Re = Y) have been performed. In all cases, almost identical electronic spectrum (both energy dispersions and the densities of states) has been obtained in a rather wide energy interval (about 2 eV) around the Fermi level. This fact is unlikely to be changed by strong correlations. This leads inevitably to the same critical temperature T c of a superconducting transition in any theoretical BCS-like mechanism of the Cooper pair formation. The experimentally observed variations of the T c for different rare-earth substitutions are either due to the disorder effects or less probably because of possible changes in the spin-fluctuation spectrum of FeAs layers caused by magnetic interactions with rare-earth spins in ReO layers.
- Subjects
HIGH temperature superconductivity; TRANSITION metal oxides; ELECTRIC conductivity; ELECTRONIC structure; RARE earth metals
- Publication
JETP Letters, 2008, Vol 87, Issue 10, p560
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S002136400810010X