Magnetic Phase Diagram of FeAs based superconductors

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The recently discovered high-temperature superconductivity in doped quaternary iron oxypnictides correlates experimentally with a magnetic instability. We have used first-principles calculations to determine a magnetic phase diagram of ReO$_{1-δ}$FeAs (Re=La--Dy) as a function of the doping $δ$, of the FeAs in-plane lattice constant $a$, and of the distance between the Fe and As planes, that is qualitatively consistent with recent experimental findings on the doping, internal (chemical) and external pressure dependence. The existence of a tricritical point (TCP) in the phase diagram suggests new ways of enhancing $T_c$.

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Superconductivity, Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/171866

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0810.3246
 http://arxiv.org/abs/0810.3246

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arXiv