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Calorimetric study of the superconducting and normal state properties of Ca(Fe1-xCox)2As2

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Singh,  S.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Stockert,  U.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Abdel-Hafiez, M., Harnagea, L., Singh, S., Stockert, U., Wurmehl, S., Leps, N., et al. (2012). Calorimetric study of the superconducting and normal state properties of Ca(Fe1-xCox)2As2. Journal of Physics: Conference Series, 391(1): 012120, pp. 1-6. doi:10.1088/1742-6596/391/1/012120.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-2099-8
Abstract
We present a calorimetric study on single crystals of Ca(Fe 1− x Co x ) 2 As 2 ( x = 0, 0.032, 0.051, 0.056, 0.063, and 0.146). The combined first order spin-density wave/structural transition occurs in the parent CaFe 2 As 2 compound at 168 K and gradually shifts to lower temperature for low doping levels ( x = 0.032 and x = 0.051). It is completely suppressed upon higher doping x ≥ 0.056. Simultaneously, superconductivity appears at lower temperature with a transition temperature around T c ~ 14.1 K for Ca(Fe 0.937 Co 0.063 ) 2 As 2 . The phase diagram of Ca(Fe 0.937 Co 0.063 ) 2 As 2 has been derived and the upper critical field is found to be μ 0 H ( c ) 2 = 11.5 T and μ 0 H (ab) c 2 = 19.4 T for the c and ab directions, respectively.