Phase diagram of superconductivity and antiferromagnetism in single crystals of Sr(Fe1xCox)2As2 and Sr1yEuy(Fe0.88Co0.12)2As2

Rongwei Hu, Sergey L. Bud’ko, Warren E. Straszheim, and Paul C. Canfield
Phys. Rev. B 83, 094520 – Published 15 March 2011

Abstract

We report magnetic susceptibility, resistivity, and heat capacity measurements on single crystals of the Sr(Fe1xCox)2As2 and Sr1yEuy(Fe0.88Co0.12)2As2 series. The optimal Co concentration for superconductivity in Sr(Fe1xCox)2As2 is determined to be x~0.12. On the basis of this, we grew members of the Sr1yEuy(Fe0.88Co0.12)2As2 series so as to examine the effects of well-defined, local magnetic moments on the superconducting state. We show that superconductivity is gradually suppressed by paramagnetic Eu2+ doping and coexists with antiferromagnetic ordering of Eu2+ as long as Tc>TN. For y0.65, TN crosses Tc and the superconducting ground state (as manifested by zero resistivity) abruptly disappears with evidence for competition between superconductivity and local moment antiferromagnetism for y up to 0.72. It is speculated that the suppression of the antiferromagnetic fluctuations of the Fe sublattice by coupling to the long-range order of the Eu2+ sublattice destroys bulk superconductivity when TN>Tc.

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  • Received 30 December 2010

DOI:https://doi.org/10.1103/PhysRevB.83.094520

©2011 American Physical Society

Authors & Affiliations

Rongwei Hu, Sergey L. Bud’ko, Warren E. Straszheim, and Paul C. Canfield

  • Ames Laboratory, US DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

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Issue

Vol. 83, Iss. 9 — 1 March 2011

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