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

Ishida, Shigeyuki*; Nakajima, Masamichi*; Tomioka, Yasuhide*; Ito, Toshimitsu*; Miyazawa, Kiichi*; Kito, Hijiri*; Lee, C.-H.*; Ishikado, Motoyuki; Shamoto, Shinichi; Iyo, Akira*; Eisaki, Hiroshi*; Kojima, Kenji*; Uchida, Shinichi*

Characteristic normal-state charge transport is found in the oxygen-deficient iron-arsenides ${it Ln}$FeAsO$$_{1-y}$$ (${it Ln}$: La and Nd) with the highest ${it T}$ $$_{c}$$'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-${it T}$ $$_{c}$$ cuprates. In the superconducting regime of the La system with maximum ${it T}$ $$_{c}$$ = 28 K, the low-temperature resistivity is dominated by a ${it T}$ $$^{2}$$ term. On the other hand, in the Nd system with ${it T}$ $$_{c}$$ higher than 40 K, the carriers are subject to stronger scattering showing ${it T}$ -linear resistivity and small magnetoresistance. Such strong scattering appears crucial for high-${it T}$ $$_{c}$$ superconductivity in the iron-based system.

Language

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English

Journal

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Physical Review B

Volume

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81

Number

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9

Pages

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p.094515_1 - 094515_6

Publication Year/Month

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2010/03

Publisher

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American Physical Society

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Paper URL

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https://doi.org/10.1103/PhysRevB.81.094515

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Research Facility

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Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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科学技術振興機構

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Percentile:33.32

Category:Materials Science, Multidisciplinary

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