论文标题
部分可观测时空混沌系统的无模型预测
Pressure-induced superconductivity in flat-band Kagome compounds Pd$_3$P$_2$(S$_{1-x}$Se$_x$)$_8$
论文作者
论文摘要
我们在平板kagome化合物上进行了高压运输研究，pd $ _3 $ p $ _2 $（s $ _ {1-x} $ se $ _x $）$ _ 8 $ _ 8 $（$ x $ = 0，0.25），带有钻石小动脉蜂窝电池。对于两种化合物，电阻率均表现出绝缘行为，压力高达17 GPa。随着压力高于20 GPA的压力，在PD $ _3 $ P $ _2 $ S $ _8 $中的高温下观察到金属行为，并且在低温下出现了超导性。超导过渡的开始温度$ t _ {\ rm c} $单调地从2 K上升到4.8 K，并且不会随着43 GPA的压力而饱和。对于Seoped的化合物PD $ _3 $ p $ _2 $（S $ _ {0.75} $ SE $ _ {0.25} $）$ _ 8 $，$ t _ {\ rm c} $比整个压力范围高约1.5 k，并与4.4 k ats 43 gpa相比，均高于整个压力范围。沿着$ C $轴施加的典型压力的上限临界场约为Pauli限制的50美元$ \％$，这表明3D超导性。金属相中的霍尔系数很低，在约30 K处表现出峰值行为，这表明系统中的多波段电子结构或电子相关效应。
We performed high-pressure transport studies on the flat-band Kagome compounds, Pd$_3$P$_2$(S$_{1-x}$Se$_x$)$_8$ ($x$ = 0, 0.25), with a diamond anvil cell. For both compounds, the resistivity exhibits an insulating behavior with pressure up to 17 GPa. With pressure above 20 GPa, a metallic behavior is observed at high temperatures in Pd$_3$P$_2$S$_8$, and superconductivity emerges at low temperatures. The onset temperature of superconducting transition $T_{\rm C}$ rises monotonically from 2 K to 4.8 K and does not saturate with pressure up to 43 GPa. For the Se-doped compound Pd$_3$P$_2$(S$_{0.75}$Se$_{0.25}$)$_8$, the $T_{\rm C}$ is about 1.5 K higher than that of the undoped one over the whole pressure range, and reaches 6.4 K at 43 GPa. The upper critical field with field applied along the $c$ axis at typical pressures is about 50$\%$ of the Pauli limit, suggesting a 3D superconductivity. The Hall coefficient in the metallic phase is low and exhibits a peaked behavior at about 30 K, which suggests either a multi-band electronic structure or an electron correlation effect in the system.
