Calorimetric study of the superconducting and normal state properties of Ca(Fe sub(1-x)Co sub(x)) sub(2)As sub(2)

We present a calorimetric study on single crystals of Ca(Fe sub(1-x)Co sub(x)) sub(2)As sub(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 sub(2)As sub(2) compound at 168 K and gradually shifts to lower te...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-01, Vol.391, p.1-6
Main Authors: Abdel-Hafiez, M, Harnagea, L, Singh, S, Stockert, U, Wurmehl, S, Leps, N, Klingeler, R, Wolter, A U B, Buchner, B
Format: Article
Language:English
Subjects:
Calorimetry
Doping
Level (quantity)
Parents
Phase diagrams
Single crystals
Superconductivity
Transition temperature
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Summary:We present a calorimetric study on single crystals of Ca(Fe sub(1-x)Co sub(x)) sub(2)As sub(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 sub(2)As sub(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 [> or =] 0.056. Simultaneously, superconductivity appears at lower temperature with a transition temperature around T sub(c) ~ 14.1 K for Ca(Fe sub(0.937)Co sub(0.063)) sub(2)As sub(2). The phase diagram of Ca(Fe sub(0.937)Co sub(0.063)) sub(2)As sub(2) has been derived and the upper critical field is found to be [mu] sub(0)H super((C)) sub(c2) = 11.5 T and /[mu] sub(0)H super((ab)) sub(c2) = 19.4 T for the c and ab directions, respectively.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/391/1/012120