Superconductivity in Sm-doped CaFe2As2 single crystals

doi:10.1088/1674-1056/25/6/067403

Abstract

In this article, the Sm-doping single crystals Ca_1-xSm_xFe₂As₂ (x=0～0.2) were prepared by the CaAs flux method, and followed by a rapid quenching treatment after the high temperature growth. The samples were characterized by structural, resistive, and magnetic measurements. The successful Sm-substitution was revealed by the reduction of the lattice parameter c, due to the smaller ionic radius of Sm³⁺ than Ca²⁺. Superconductivity was observed in all samples with onset T_c varying from 27 K to 44 K upon Sm-doping. The coexistence of a collapsed phase transition and the superconducting transition was found for the lower Sm-doping samples. Zero resistivity and substantial superconducting volume fraction only happen in higher Sm-doping crystals with the nominal x >0.10. The doping dependences of the c-axis length and onset T_c were summarized. The high-T_c observed in these quenched crystals may be attributed to simultaneous tuning of electron carriers doping and strain effect caused by lattice reduction of Sm-substitution.

Keywords: superconductivity Sm-doping CaFe₂As₂ collapsed structure

Received: 22 April 2016
Revised: 26 April 2016
Accepted manuscript online:

PACS:	74.70.Xa	(Pnictides and chalcogenides)
	74.70.-b	(Superconducting materials other than cuprates)
	74.72.Ek	(Electron-doped)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 11474339), the National Basic Research Program of China (Grant Nos. 2010CB923000 and 2011CBA00100), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07020100).

Corresponding Authors: Zhi-An Ren
E-mail: renzhian@iphy.ac.cn

Cite this article:

Dong-Yun Chen(陈东云), Bin-Bin Ruan(阮彬彬), Jia Yu(于佳), Qi Guo(郭琦), Xiao-Chuan Wang(王小川), Qing-Ge Mu(穆青隔), Bo-Jin Pan(潘伯津), Tong Liu(刘通), Gen-Fu Chen(陈根富), Zhi-An Ren(任治安) Superconductivity in Sm-doped CaFe₂As₂single crystals 2016 Chin. Phys. B 25 067403

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Superconductivity in Sm-doped CaFe₂As₂single crystals