The reason why doping causes superconductivity in LaFeAsO

Details The reason why doping causes superconductivity in LaFeAsO The reason why doping causes superconductivity in LaFeAsO

2011-12-14

arxiv.org/abs/1112.3169v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1007/s10948-012-1408-5

The experimental observation of superconductivity in LaFeAsO appearing on doping is analyzed with the group-theoretical approach that evidently led in a foregoing paper (J. Supercond 24:2103, 2011) to an understanding of the cause of both the antiferromagnetic state and the accompanying structural distortion in this material. Doping, like the structural distortions, means also a reduction of the symmetry of the pure perfect crystal. In the present paper we show that this reduction modifies the correlated motion of the electrons in a special narrow half-filled band of LaFeAsO in such a way that these electrons produce a stable superconducting state.

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