Strong carrier-scattering in iron-pnictide superconductors with highest Tc obtained from charge transport experiments

Details Strong carrier-scattering in iron-pnictide superconductors with highest Tc obtained from charge transport experiments Strong carrier-scattering in iron-pnictide superconductors with highest Tc obtained from charge transport experiments

2010-03-26

arxiv.org/abs/1003.5039v1

Phys. Rev. B 81, 094515 (2010)

Physics

Condensed Matter

Superconductivity

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.81.094515

Characteristic normal-state charge transport is found in the oxygen-deficient iron-arsenides LnFeAsO1-y (Ln: La and Nd) with the highest Tc's among known Fe-based superconductors. The effect of "doping" in this system is mainly on the carrier scattering, quite distinct from that in high-Tc cuprates. In the superconducting regime of the La system with maximum Tc = 28 K, the low-temperature resistivity is dominated by a T^2 term. On the other hand, in the Nd system with Tc higher than 40 K, the carriers are subject to stronger scattering showing T-linear resistivity and small magnetoresistance. Such strong scattering appears crucial for high-Tc superconductivity in the iron-based system.

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