| Issue |
EPL
Volume 88, Number 3, November 2009
|
|
|---|---|---|
| Article Number | 37004 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/88/37004 | |
| Published online | 19 November 2009 | |
Polaron-like conduction in iron pnictides of the Ln-1111 and Æ-122 families
Institut Néel, Centre National de Recherches Scientifiques and Université Joseph Fourier BP166 cedex 9, 38042 Grenoble, France, EU
Corresponding author: nunez@grenoble.cnrs.fr
Received:
2
July
2009
Accepted:
9
October
2009
The examination of the electrical resistivities of iron pnictides shows that they follow a 
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.
PACS: 72.15.-v – Electronic conduction in metals and alloys / 74.90.+n – Other topics in superconductivity
© EPLA, 2009
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