Evidence for polarons in iron pnictides of the Ln-1111 and AE-122 families

Details Evidence for polarons in iron pnictides of the Ln-1111 and AE-122 families Evidence for polarons in iron pnictides of the Ln-1111 and AE-122 families

2009-04-07

arxiv.org/abs/0904.1173v1

EPL 88 (2009) 37004

Physics

Condensed Matter

Superconductivity

14 pages with 4 Figures

Scientific paper

Examination of the electrical resistivities of iron pnictides shows that they can be accounted by conduction by polarons. Their activation energies show a linear behaviour with the critical temperatures of the spin density waves (SDW), T*, as both vary with pressure. The slope matches the ratio SDW gap to T*, while the intercept can be related to the transition temperature of the lattice distortion, T0. An adapted Landau free energy predicts the observed order of the transitions, according to which is higher, T* or T0. Simple arguments favour combined Jahn-Teller antiferromagnetic bipolarons.

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