Pressure effect on superconductivity of iron-based arsenic-oxide ReFeAsO0.85 (Re=Sm and Nd)

Here we report pressure effects on the superconducting transition temperature $(T_{{\rm c}})$ of the ReFeAsO0.85 (Re = Sm and Nd) system without fluorine doping. In situ measurements under high pressure showed that $T_{{\rm c}}$ of the two compounds decreases monotonously over the pressure range inv...

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Bibliographic Details
Published in:Europhysics letters 2008-09, Vol.83 (5), p.57002-57002(4)
Main Authors: Yi, Wei, Sun, Liling, Ren, Zhian, Lu, Wei, Dong, Xiaoli, Zhang, Hai-jun, Dai, Xi, Fang, Zhong, Li, Zhengcai, Che, Guangcan, Yang, Jie, Shen, Xiaoli, Zhou, Fang, Zhao, Zhongxian
Format: Article
Language:English
Subjects:
62.50.-p
74.70.-b
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Summary:Here we report pressure effects on the superconducting transition temperature $(T_{{\rm c}})$ of the ReFeAsO0.85 (Re = Sm and Nd) system without fluorine doping. In situ measurements under high pressure showed that $T_{{\rm c}}$ of the two compounds decreases monotonously over the pressure range investigated. The pressure coefficients ${\rm d}T_{{\rm c}}/{\rm d}P$ in SmFeAsO0.85 and NdFeAsO0.85 were different, revealing the important influence of the deformation in layers on $T_{{\rm c}}$. Theoretical calculations suggested that the electron density of states decreases with increasing pressure, following the same trend of experimental data.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/83/57002