Mobility analysis of FeTe thin films

Details Mobility analysis of FeTe thin films Mobility analysis of FeTe thin films

2010-09-30

arxiv.org/abs/1009.6035v2

Physics

Condensed Matter

Superconductivity

8 pages, 3 figures. Accepted for publication in J. Phys. Soc. Jpn

Scientific paper

10.1016/j.physc.2011.05.012

The Hall effect is investigated in detail for nonsuperconducting and superconducting FeTe thin films. The Hall coefficient commonly exhibits a sign reversal from positive in a high-temperature paramagnetic state to negative in a low-temperature antiferromagnetic state. Phenomenological analysis by a simple two-band Drude model indicates that hole mobility is significantly suppressed in the antiferromagnetic state. When suppression of the hole mobility is insufficient, superconductivity shows up in FeTe. This result strongly suggests that the itinerancy in both hole and electron channels is the essential factor for the occurrence of superconductivity in iron chalcogenide superconductors.

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