Inverse iron isotope effect on the transition temperature of the (Ba,K)Fe2As2 superconductor.

Shirage, Parasharam M; Kihou, Kunihiro; Miyazawa, Kiichi; Lee, Chul-Ho; Kito, Hijiri; Eisaki, Hiroshi; Yanagisawa, Takashi; Tanaka, Yasumoto; Iyo, Akira

Shirage, Parasharam M; Kihou, Kunihiro; Miyazawa, Kiichi; Lee, Chul-Ho; Kito, Hijiri; Eisaki, Hiroshi; Yanagisawa, Takashi; Tanaka, Yasumoto; Iyo, Akira.

Afiliación

Shirage PM; National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan. paras-shirage@aist.go.jp

Phys Rev Lett ; 103(25): 257003, 2009 Dec 18.

Article en En | MEDLINE | ID: mdl-20366277

RESUMEN

We report that the (Ba,K)Fe(2)As(2) superconductor (transition temperature, T(c) approximately 38 K) has an inverse iron isotope coefficient alpha(Fe) = -0.18(3) (where T(c) approximately M(-alphaFe) and M is the iron isotope mass); i.e., the sample containing the large iron isotope mass depicts a higher T(c). Systematic inverse shifts in T(c) were clearly observed between the samples using three types of Fe isotopes ((54)Fe, natural Fe, and (57)Fe). This indicates the first evidence of the inverse isotope effect in high-T(c) superconductors. This anomalous mass dependence on T(c) implies an exotic coupling mechanism in Fe-based superconductors.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2009 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Estados Unidos

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