Composition dependence of bulk superconductivity in YFe2Ge2

Chen, Jiasheng, Gamza, Monika orcid iconORCID: 0000-0003-3360-4006, Semeniuk, Konstantin and Grosche, F. Malte (2019) Composition dependence of bulk superconductivity in YFe2Ge2. Physical Review B, 99 (2). ISSN 2469-9950

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In the layered iron-based superconductor YFe2Ge2, a high Sommerfeld ratio of ∼100 mJ/(mol K^2) and a T^(3/2) temperature dependence of the electrical resistivity at low temperature T indicate strong electronic correlations and point towards an unconventional pairing state. We have investigated the role of composition and annealing conditions in optimizing the growth of high-quality YFe2Ge2. Our findings confirm that bulk superconductivity is observed in samples with disorder scattering rates less than 2k_BTc/(h/2pi). Fe deficiency on the Fe site is identified as the dominant source of disorder, which can be minimised by precipitating from a slightly iron-rich melt, following by annealing.

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