Single crystal growth and superconductivity of Ca(Fe_1−xCo_x)₂As₂

Abstract

We report the single crystal growth of Ca(Fe_1−x Co _x )₂As₂ (0 ≤ x ≤ 0.082) from Sn flux. The temperature–composition phase diagram is mapped out based on the magnetic susceptibility and electrical transport measurements. The phase diagram of Ca(Fe_1−x Co _x )₂As₂ is qualitatively different from those of Sr and Ba; this could be due to both the charge doping and structural tuning effects associated with Co substitution.

Keywords:

• phase diagram
• single crystal growth
• superconductivity
• magnetic properties
• electrical properties

Acknowledgments

This work was carried out at the Iowa State University and supported by the AFOSR-MURI grant #FA9550-09-1-0603 (R.H. and P.C.C.). Part of this work was performed at Ames Laboratory, US DOE, under contract #DE-AC02-07CH 11358 (S.R., S.L.B. and P.C.C.). S.L. Bud'ko also acknowledges partial support from the State of Iowa through Iowa State University.

Notes

The work was authored as part of Rongwei Hu's official duties as an employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105 no copyright protection is available for such works under U.S. law.

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Notes on contributors

Rongwei Hu

The work was authored as part of Rongwei Hu's official duties as an employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105 no copyright protection is available for such works under U.S. law.