Strong carrier-scattering in iron-pnictide superconductors Ln FeAsO 1-y ( Ln=La and Nd) obtained from charge transport experiments

S. Ishida, M. Nakajima, Y. Tomioka, T. Ito, K. Miyazawa, H. Kito, C. H. Lee, M. Ishikado, S. Shamoto, A. Iyo, H. Eisaki, K. M. Kojima, S. Uchida

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22 Citations (Scopus)

Abstract

Characteristic normal-state charge transport is found in the oxygen-deficient iron-arsenides Ln FeAsO1-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 T2 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.

Original languageEnglish
Article number094515
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number9
DOIs
Publication statusPublished - 2010 Mar 16

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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