Superconductivity and phase diagram in iron-based arsenic-oxides ReFeAsO$_{1 - \delta}$ (Re = rare-earth metal) without fluorine doping

Here we report a new class of superconductors prepared by high-pressure synthesis in the quaternary family ReFeAsO$_{1-\delta}$ (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,...

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Bibliographic Details
Published in:Europhysics letters 2008-07, Vol.83 (1)
Main Authors: Ren, Zhi-An, Che, Guang-Can, Dong, Xiao-Li, Yang, Jie, Lu, Wei, Yi, Wei, Shen, Xiao-Li, Li, Zheng-Cai, Sun, Li-Ling, Zhou, Fang, Zhao, Zhong-Xian
Format: Article
Language:English
Subjects:
74.10.+v
74.70.-b
Online Access:Get full text
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Summary:Here we report a new class of superconductors prepared by high-pressure synthesis in the quaternary family ReFeAsO$_{1-\delta}$ (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 SmFeAsO$_{1-\delta}$. For the NdFeAsO$_{1-\delta }$ compound with different oxygen concentration a dome-shaped phase diagram was found.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/83/17002