Unconventional bulk superconductivity in YFe2Ge2single crystals

Chen, Jiasheng, Gamza, Monika orcid iconORCID: 0000-0003-3360-4006, Banda, Jacintha, Murphy, Keiron, Tarrant, James, Brando, Manuel and Grosche, F. Malte (2020) Unconventional bulk superconductivity in YFe2Ge2single crystals. Physical Review Letters, 125 . p. 237002. ISSN 0031-9007

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Official URL: https://doi.org/10.1103/PhysRevLett.125.237002


Sharp superconducting transition anomalies observed in a new generation of single crystals establish that bulk superconductivity is intrinsic to high purity YFe2Ge2. Low temperature heat capacity measurements suggest a disorder and field-dependent residual Sommerfeld coefficient, consistent with disorder-induced in-gap states as expected for a sign-changing order parameter. The sevenfold reduction in disorder scattering in these new crystals to residual resistivities ~0.45 μΩ cm was achieved using a new liquid transport growth technique, paving the way for multi-probe experiments investigating the normal and superconducting states of YFe2Ge2.

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