Pressure effect on superconductivity of iron-based arsenic-oxide ReFeAsO0.85 (Re = Sm and Nd)Wei Yi, Liling Sun, Zhian Ren, Wei Lu, Xiaoli Dong, Hai-jun Zhang, Xi Dai, Zhong Fang, Zhengcai Li, Guangcan Che, Jie Yang, Xiaoli Shen, Fang Zhou and Zhongxian Zhao
Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences - Beijing 100190, PRC
received 2 July 2008; accepted in final form 24 July 2008; published September 2008
published online 6 August 2008
Here we report pressure effects on the superconducting transition temperature of the ReFeAsO0.85 (Re = Sm and Nd) system without fluorine doping. In situ measurements under high pressure showed that of the two compounds decreases monotonously over the pressure range investigated. The pressure coefficients in SmFeAsO0.85 and NdFeAsO0.85 were different, revealing the important influence of the deformation in layers on . Theoretical calculations suggested that the electron density of states decreases with increasing pressure, following the same trend of experimental data.
74.70.-b - Superconducting materials.
62.50.-p - High-pressure effects in solids and liquids.
© EPLA 2008