Abstract
Single crystals of (CaLa)(PtAs)(FeAs) (–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 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 around 26 K is observed in the temperature-concentration phase diagram.
- Received 17 December 2012
DOI:https://doi.org/10.1103/PhysRevB.87.060507
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