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Superconductivity and phase diagram in iron-based arsenic-oxides ReFeAsO 1−δ (Re = rare-earth metal) without fluorine doping

2008; Institute of Physics; Volume: 83; Issue: 1 Linguagem: Inglês

10.1209/0295-5075/83/17002

ISSN

1286-4854

Autores

Zhi‐An Ren, Guangcan Che, Xiaoli Dong, Jie Yang, Wei Lu, Wei Yi, Xiaoli Shen, Zhengcai Li, Liling Sun, Fang Zhou, Zhongxian Zhao,

Tópico(s)

Physics of Superconductivity and Magnetism

Resumo

Here we report a new class of superconductors prepared by high-pressure synthesis in the quaternary family ReFeAsO1−δ (Re=Sm, Nd, Pr, Ce, La) without fluorine doping. The onset superconducting critical temperature (Tc) in these compounds increases with the reduction of the Re atom size, and the highest Tc obtained so far is 55 K in SmFeAsO1−δ. For the NdFeAsO1−δ compound with different oxygen concentration a dome-shaped phase diagram was found.

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