Unconventional bulk superconductivity in YFe${}_2$Ge${}_2$ single crystals

Abstract

Using a new horizontal flux growth technique to produce high quality crystals of the unconventional superconductor YFe${}_2$Ge${}_2$ has led to a seven-fold reduction in disorder scattering, resulting in mm-sized crystals with residual resistivities $\simeq \SI{0.45}{\micro\ohm\centi\meter}$, resistivity ratios $\simeq 430$ and sharp superconducting heat capacity anomalies. This enables searching multi-probe experiments investigating the normal and superconducting states of YFe${}_2$Ge${}_2$. Low temperature heat capacity measurements suggest a significant residual Sommerfeld coefficient, consistent with in-gap states induced by residual disorder as predicted for a sign-changing order parameter.

arXiv comment5 pages, 6 figures

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Cited by in corpus (5)

• Molten Salt Flux Liquid Transport Method for Ultra Clean Single Crystals UTe2
• Unraveling the origin of Kondo-like behavior in the 3$d$-electron heavy-fermion compound YFe${}_2$Ge${}_2$
• Fermi surface and mass renormalization in the iron-based superconductor YFe${}_2$Ge${}_2$
• Time reversal symmetry breaking and s-wave superconductivity in CaPd2Ge2: A $\mu$SR study
• Intrinsic defect intolerance in the ultra-pure metal PtSn${}_4$