退火FeTe $_{1-x}$ Se $_x$（0.1 $\leq$ $x$ $\leq$ 0.4）多带超导体的超导和输运性质的演变
Evolution of superconducting and transport properties in annealed FeTe$_{1-x}$Se$_x$ (0.1 $\leq$ $x$ $\leq$ 0.4) multiband superconductors
摘要：
本文研究了O-$_2$退火法制备的FeTe $_{1-x}$ Se $_{x}$（0.1 $\leq$ $x$ $\leq$ 0.4）单晶的超导和输运性质。磁化强度测量中观察到的尖锐的超导转变宽度和小的剩余电阻率证明了晶体的高质量。所有晶体都具有大的、均匀的、各向同性的临界电流密度\emph{J} $_c$，在2 K时自场值超过10 $^5$ A/cm $^2$。大的临界电流密度证明了FeTe $_{1-x}$ Se $_{x}$（0.1 $\leq$ $x$ $\leq$ 0.4）中的超导性是块体性质的.对于不同Se掺杂水平的晶体，接近于$T_c$的各向异性参数的值都位于2 - 3的范围内。霍尔系数$R_H$在高温下保持正值且几乎恒定，随后在达到$T$ $_c$之前突然减小，这表明电子型电荷载流子在低温下成为主导。此外，$R_H$突然降低的特征温度随着Se掺杂而逐渐增加。
英文摘要：
We investigated the superconducting and transport properties in FeTe$_{1-x}$Se$_{x}$ (0.1 $\leq$ $x$ $\leq$ 0.4) single crystals prepared by O$_2$-annealing. Sharp superconducting transition width observed in magnetization measurement and the small residual resistivity prove the high quality of the crystals. All the crystals manifest large, homogeneous, and isotropic critical current density \emph{J}$_c$ with self-field value over 10$^5$ A/cm$^2$ at 2 K. The large and field-robust critical current densities prove that the superconductivity in FeTe$_{1-x}$Se$_{x}$ (0.1 $\leq$ $x$ $\leq$ 0.4) is in bulk nature. The values of anisotropy parameter close to $T_c$ for crystals with different Se doping levels all reside in the range of 2 - 3. Hall coefficients $R_H$ keeps positive and almost constant value at high temperatures, followed by a sudden decreases before reaching $T$$_c$, which indicates that the electron-type charge carriers become dominant at low temperatures. Furthermore, the characteristic temperature for the sudden decrease in $R_H$ gradually increases with Se doping.
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