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Doping effect on the carrier scattering in iron-pnictide superconductors studied by charge transport |
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| Authors: | Shigeyuki Ishida Masamichi Nakajima Motoyuki Ishikado Yasuhide Tomioka Toshimitsu Ito Kiichi Miyazawa Chul-Ho Lee Hijiri Kito Shin-ichi Shamoto Akira Iyo Hiroshi Eisaki Kenji M. Kojima Teruhisa Kakeshita Shin-ichi Uchida |
| Affiliation: | a Department of Physics, University of Tokyo, Tokyo 113-0033, Japan b National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan c Department of Applied Electronics, Tokyo University of Science, Chiba 278-3510, Japan d Japan Atomic Energy Agency, Ibaraki 319-1195, Japan e JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan |
| Abstract: | 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 LnFeAsO1−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-Tc cuprates. In the case of La system with lower Tc, the low temperature resistivity is dominated by T2 term and fairly large magnetoresistance is observed. On the other hand, in the Nd system with higher Tc, carriers are subject to stronger scattering showing nearly T-linear resistivity and small magnetoresistance. Such strong scattering appears intimately correlated with high-Tc superconductivity in the iron-based system. |
| Keywords: | A. Superconductors D. Superconductivity D. Transport properties |
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