Local inhomogeneity and filamentary superconductivity in Pr-doped CaFe2As2.

  title={Local inhomogeneity and filamentary superconductivity in Pr-doped CaFe2As2.},
  author={K Gofryk and Minghu Pan and Claudia Cantoni and Bayrammurad Saparov and Jonathan E Mitchell and A S Sefat},
  journal={Physical review letters},
  volume={112 4},
We use multiscale techniques to determine the extent of local inhomogeneity and superconductivity in Ca0.86Pr0.14Fe2As2 single crystal. The inhomogeneity is manifested as a spatial variation of the praseodymium concentration, local density of states, and superconducting order parameter. We show that the high-Tc superconductivity emerges from cloverlike defects associated with Pr dopants. The highest Tc is observed in both the tetragonal and collapsed tetragonal phases, and its filamentary… CONTINUE READING

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