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Updated: May 2, 2026

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties
Published on: August 15, 2015
Local inhomogeneity and filamentary superconductivity in Pr-doped CaFe2As2
Krzysztof Gofryk1, Minghu Pan1, Claudia Cantoni1
1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Abstract:
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 nature is a consequence of nonuniform Pr distribution that develops localized, isolated superconducting regions within the crystals.
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