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Pressure Effect on Superconductivity of Iron-based Arsenic-oxide ReFeAsO0.85 (Re=Sm and Nd)

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arxiv 0807.0675 v2 pith:Q4R75V3Q submitted 2008-07-04 cond-mat.supr-con

Pressure Effect on Superconductivity of Iron-based Arsenic-oxide ReFeAsO0.85 (Re=Sm and Nd)

W. Yi , L. Sun , Z. Ren , X. Dong , H.Zhang , X. Dai , Z. Fang , G. Che
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J. Yang Z. Li X. Shen F. Zhou Z. Zhao
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classification cond-mat.supr-con
keywords pressuredecreaseeffectrefeaso0arsenic-oxidecalculationscoefficientscompounds
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Here we report pressure effect on superconducting transition temperature (Tc) of ReFeAsO0.85 (Re= Sm and Nd) system without fluorine doping. In-situ measurements under high pressure showed that Tc of the two compounds decrease monotonously over the pressure range investigated. The pressure coefficients dTc/dP in SmFeAsO0.85 and Nd FeAsO0.85 were different, revealing the important influence of the deformation in layers on Tc. Theoretical calculations suggested that the electron density of states decrease with increasing pressure, following the same trend of experimental data.

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