Fermi liquid breakdown and evidence for superconductivity in YFe$_2$Ge$_2$

F. M. Grosche; G. I. Lampronti; J. Chen; P. W. Logg; Y. Zou; Z. Feng

arxiv: 1311.0247 · v2 · pith:LNTG5KUZnew · submitted 2013-11-01 · ❄️ cond-mat.str-el · cond-mat.supr-con

Fermi liquid breakdown and evidence for superconductivity in YFe₂Ge₂

Y. Zou , Z. Feng , P. W. Logg , J. Chen , G. I. Lampronti , F. M. Grosche This is my paper

classification ❄️ cond-mat.str-el cond-mat.supr-con

keywords breakdownfermiliquidmathrmtemperatureaccompaniedanomalousbelow

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In the d-electron system YFe$_2$Ge$_2$, an unusually high and temperature dependent Sommerfeld ratio of the specific heat capacity $C/T \sim 100~\mathrm{mJ/(molK^2)}$ and an anomalous power law temperature dependence of the electrical resistivity $\rho \simeq \rho_0 + AT^{3/2}$ 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 YFe$_2$Ge$_2$ superconduct below $1.8~\mathrm{K}$.

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Fermi liquid breakdown and evidence for superconductivity in YFe₂Ge₂

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