Pressure-Induced Superconductivity in Flat-Band Kagome Compounds Pd3P2(S(1 – x)Sex)8
Pressure-Induced Superconductivity in Flat-Band Kagome Compounds Pd3P2(S(1 – x)Sex)8
复制标题
平带 Kagome 化合物 Pd3P2(S(1 – x)Sex)8 中的压力诱导超导性
DOI：
10.1088/0256-307x/39/6/067404
复制
发表时间：
2022
影响因子：
3.5
通讯作者：
Yu Weiqiang
中科院分区：
文献类型：
--
作者：
Li Shuo;Han Shuo;Yan Shaohua;Cui Yi;Wang Le;Wang Shanmin;Chen Shanshan;Lei Hechang;Yuan Feng;Zhang Jinshan;Yu Weiqiang
我们使用金刚石砧室对平带 Kagome 化合物 Pd 3 P 2 (S 1 – x Se x ) 8 ( x = 0, 0.25) 进行了高压输运研究。对于这两种化合物，电阻率在压力高达 17 GPa 时表现出绝缘行为。当压力高于20 GPa时，Pd 3 P 2 S 8 在高温下观察到金属行为，并且在低温下出现超导性。超导转变的起始温度 T C 从 2 K 单调上升到 4.8 K，并且在压力高达 43 GPa 时不会饱和。 Se掺杂化合物Pd 3 P 2 (S 0.75 Se 0.25 ) 8 的T C 在整个压力范围内比未掺杂的化合物高约1.5 K，并在43 GPa下达到6.4 K。在典型压力下沿 c 轴施加场的上临界场约为泡利极限的 50%，表明存在 3D 超导性。金属相的霍尔系数较低，并在 30 K 左右表现出峰值行为，这表明系统中存在多能带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 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 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.