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; Zhongxian Zhao

doi:10.1209/0295-5075/83/57002

All issues

Volume 83 / No 5 (September 2008)

EPL, 83 5 (2008) 57002

Abstract

Issue		EPL Volume 83, Number 5, September 2008


Article Number		57002
Number of page(s)		4
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/83/57002
Published online		06 August 2008

EPL, 83 (2008) 57002

Pressure effect on superconductivity of iron-based arsenic-oxide ReFeAsO_0.85 (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

Corresponding authors: llsun@aphy.iphy.ac.cn zhxzhao@aphy.iphy.ac.cn

Received: 2 July 2008
Accepted: 24 July 2008

Abstract

Here we report pressure effects on the superconducting transition temperature $(T_{{\rm c}})$ of the ReFeAsO_0.85 (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 SmFeAsO_0.85 and NdFeAsO_0.85 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.

PACS: 74.70.-b – Superconducting materials / 62.50.-p – High-pressure effects in solids and liquids

© EPLA, 2008

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