Heavy anion solvation of polarity fluctuations in Pnictides

Details Heavy anion solvation of polarity fluctuations in Pnictides Heavy anion solvation of polarity fluctuations in Pnictides

2008-08-10

arxiv.org/abs/0808.1390v1

Physics

Condensed Matter

Superconductivity

Scientific paper

Once again the condensed matter world has been surprised by the discovery of yet another class of high temperature superconductors. The discovery of iron-pnictide (FeAs) and chalcogenide (FeSe) based superconductors with a $T_c$ of up to 55 K is again evidence of how complex the many body problem really is, or in another view how resourceful nature is. The first reactions would of course be that these new materials must in some way be related to the copper-oxide based superconductors for which a large number of theories exist although a general consensus regarding the correct theory has not yet been reached. Here we point out that the basic physical paradigm of the new iron based superconductors is entirely different from the cuprates. Their fundamental properties, structural and electronic, are dominated by the exceptionally large pnictide polarizabilities.

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