论文标题
SE替换在分层BICH $ _2 $ b的基于（CH = S，SE）超导体$ _ $ _ {1-x} $ f $ _x $ _x $ bis $ _ {2-y} $ se $ se $ _y $ $ $ $ $ $ $ $ _y $ $ $ y $的弱抗抗钙化诱导的弱抗内置化。
Weak antilocalization induced by Se substitution in layered BiCh$_2$-based (Ch = S, Se) superconductors LaO$_{1-x}$F$_x$BiS$_{2-y}$Se$_y$
论文作者
论文摘要
我们报告了分层BICH2（CH = S，SE）超导体LAO1-XFXBIS2-YSEY（X = 0.2、0.5，Y = 0-1.05）的传输特性，并观察弱抗静脉化（WAL）。 Se-Poor样品的电阻率和HALL系数随温度降低而增加。随着SE浓度的增加表明损失绝缘行为，增加的增加变得不那么明显。有趣的是，中等拟合的样品在高温区域表现出金属行为，并且低温区域的电阻率较弱，这表明载体定位的存在。 se取代的化合物在整个温度区域显示金属行为。对于X = 0.2样品，观察到HALL系数的符号变化，这可能与电荷密度波（CDW）有关。磁化测量结果表明WAL是在重度确定的系统中实现的。 F和SE浓度的变化削弱了WAL行为。 WAL和WL的交叉状态围绕中等的F掺杂且无SE-8F0.2BIS2。 F和SE替代的电阻率行为的变化显然与磁导体的差异相关。此外，Wal-WL跨界和弱WAL国家的定位区域可能与CDW有关。我们建议基于BICH2的系统是研究WAL，超导性和电子顺序之间关系的良好平台，因为这些状态可以通过具有块状单晶的元素取代来调整。
We report transport properties for layered BiCh2-based (Ch = S, Se) superconductors LaO1-xFxBiS2-ySey (x = 0.2, 0.5, y = 0-1.05) and the observation of weak antilocalization (WAL). Electrical resistivity and Hall coefficients for the Se-poor samples increase with decreasing temperature. The increase becomes less pronounced with increasing Se concentration indicating a loss of insulating behavior. Interestingly, the moderately Se-substituted samples exhibit metallic behavior in the high-temperature region and a weak increase in the resistivity in the low-temperature regions, which indicates the existence of carrier localization. The heavily Se-substituted compounds show metallic behavior in the entire-temperature region. Sign changes of the Hall coefficients are observed for the x = 0.2 samples, which possibly is related to a charge-density wave (CDW). Magnetoresistance measurements indicate that WAL is realized in the heavily Se-substituted systems. The WAL behavior is weakened by the changes in F and Se concentrations. A crossover state of the WAL and WL emerges around the moderately F-doped and Se-free LaO0.8F0.2BiS2. The change of the resistivity behavior by the F and Se substitution clearly correlates to the difference of the magnetoconductance. Moreover, the localization regions of the WAL-WL crossover and weak WAL states are possibly associated with the CDW. We propose that the BiCh2-based system is a good platform for studying relationship between WAL, superconductivity, and electronic ordering because those states are tunable by element substitutions with bulk single crystals.
