论文标题
yfe $ _2 $ ge $ _2 $单晶的非常规散装超导性
Unconventional bulk superconductivity in YFe$_2$Ge$_2$ single crystals
论文作者
论文摘要
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 $和尖锐的超导热容量异常。这使搜索多探针实验调查了yfe $ _2 $ ge $ _2 $的正常和超导状态。低温热容量测量表明，剩余的Sommerfeld系数显着，与因签名阶阶参数所预测的残留障碍引起的间隙状态一致。
Using a new horizontal flux growth technique to produce high quality crystals of the unconventional superconductor YFe$_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.
