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

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arxiv 1212.4104 v2 pith:7V35O6I6 submitted 2012-12-17 cond-mat.supr-con cond-mat.str-el

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-concond-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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  1. Preformed Cooper Pairs in a Triclinic Iron Pnictide Superconductor

    cond-mat.supr-con 2025-01 conditional novelty 6.0 of 10

    In a triclinic iron pnictide superconductor, a spin resonance precursor, Nernst signal, and NMR density-of-states reduction all point to preformed Cooper pairs persisting to T* = 45 K, above Tc = 30 K.

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