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In the layered iron-based superconductor YFe2Ge2, a high Sommerfeld ratio of~100 mJ/molK^2 and a T^(3/2) temperature dependence of the electricalresistivity at low temperature T indicate strong electronic correlations andpoint towards an unconventional pairing state. We have investigated the role ofcomposition and annealing conditions in optimizing the growth of high-qualityYFe2Ge2. Our findings confirm that bulk superconductivity is observed insamples with disorder scattering rates less than 2 k_B T_c/hbar. Fe deficiencyon the Fe site is identified as the dominant source of disorder, which can beminimised by precipitating from a slightly iron-rich melt, following byannealing.

Composition dependence of bulk superconductivity in YFe2Ge2