Fermi liquid breakdown and evidence for superconductivity in YFe2Ge2
Abstract
In the d-electron system YFe2Ge2, an unusually high and temperature dependent Sommerfeld ratio of the specific heat capacity C/T 100~mJ/(molK2) and an anomalous power law temperature dependence of the electrical resistivity 0 + AT3/2 signal Fermi liquid breakdown, probably connected to a close-by quantum critical point. Full resistive transitions, accompanied by DC diamagnetic screening fractions of up to 80\% suggest that pure samples of YFe2Ge2 superconduct below 1.8~K.
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