M. Núñez-Regueiro 2009 EPL 88 37004 doi:10.1209/0295-5075/88/37004
M. Núñez-Regueiro
Show affiliationsThe examination of the electrical resistivities of iron pnictides shows that they follow a ρ~T exp(Ea/kBT) temperature dependence. The activation energies Ea 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. We discuss our analysis within the framework of polarons.
72.15.-v Electronic conduction in metals and alloys
74.90.+n Other topics in superconductivity (restricted to new topics in section 74)
Issue 3 (November 2009)
Received 2 July 2009, accepted for publication 9 October 2009
Published 19 November 2009
M. Núñez-Regueiro 2009 EPL 88 37004
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