Temperature-concentration phase diagram of (Ca1-xLax)10(Pt3As8)(Fe2As2)5 superconductors

N. Ni , W. E. Straszheim , D. J. Williams , M. A. Tanatar , R. Prozorov , E. D. Bauer , F. Ronning , J. D. Thompson

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R. J. Cava

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classification ❄️ cond-mat.supr-con cond-mat.str-el

keywords phasemagneticaroundca1-xlaxdiagramfe2as2pt3as8structural

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Single crystals of (Ca1-xLax)10(Pt3As8)(Fe2As2)5 (x = 0 to 0.182) superconductors have been grown and characterized by X-ray, microprobe, transport and thermodynamic measurements. Features in the magnetic susceptibility, specific heat and two kinks in the derivative of the electrical resistivity around 100 K in the x = 0 compound support the existence of decoupled structural and magnetic phase transitions. With La doping, the structural/magnetic phase transitions are suppressed and a half-dome of superconductivity with a maximal Tc around 26 K is observed in the temperature-concentration phase diagram.

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Temperature-concentration phase diagram of (Ca1-xLax)10(Pt3As8)(Fe2As2)5 superconductors

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