Doping effect on the carrier scattering in iron-pnictide superconductors studied by charge transport

作者：Ishida Shigeyuki; Nakajima Masamichi; Ishikado Motoyuki; Tomioka Yasuhide; Ito Toshimitsu; Miyazawa Kiichi; Lee Chul Ho; Kito Hijiri; Shamoto Shin ichi; Iyo Akira; Eisaki Hiroshi; Kojima Kenji M; Kakeshita Teruhisa; Uchida Shin ichi^*

来源：Journal of Physics and Chemistry of Solids, 2011, 72(5): 407-409.

DOI：10.1016/j.jpcs.2010.10.054

• Superconductors
• Superconductivity
• Transport properties

In order to reveal the role of "carrier doping" in the iron-based superconductors, we investigated the transport properties of the oxygen-deficient iron-arsenides LnFeAsO(1-y), (Ln = La, Ce, Pr and Nd) over a wide doping range. We found that the effect of "doping" in this system is mainly on the carrier scattering rather than carrier density, quite distinct from that in high-T-c cuprates. In the case of La system with lower T-c, the low temperature resistivity is dominated by T-2 term and fairly large magnetoresistance is observed. On the other hand, in the Nd system with higher T-c, carriers are subject to stronger scattering showing nearly T-linear resistivity and small magnetoresistance. Such strong scattering appears intimately correlated with high-T-c superconductivity in the iron-based system.

• 出版日期2011-5