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arXiv 2301.09050cond-mat.supr-con
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准一维半金属$\mathrm{Ta}_2 \mathrm{PdSe}_6$中的压力诱导超导

Pressure-induced superconductivity in quasi-one-dimensional semimetal $\mathrm{Ta}_2 \mathrm{PdSe}_6$

Haiyang Yang, Yonghui Zhou, Liangyu Li, Zheng Chen, Zhuyi Zhang, Shuyang Wang, Jing Wang, Xuliang Chen, Chao An, Ying Zhou, Min Zhang, Ranran Zhang, Xiangde Zhu… 展开作者

Haiyang Yang, Yonghui Zhou, Liangyu Li, Zheng Chen, Zhuyi Zhang, Shuyang Wang, Jing Wang, Xuliang Chen, Chao An, Ying Zhou, Min Zhang, Ranran Zhang, Xiangde Zhu, Lili Zhang, Xiaoping Yang, Zhaorong Yang

摘要:

在这里,我们报告的发现压力诱导的超导准一维$\mathrm{Ta}_2 \mathrm{PdSe}_6$,通过电输运,同步辐射X射线衍射和理论计算相结合。我们的输运测量表明,超导性出现在一个临界压力$P_{\mathrm{c}} \sim 18.3$ GPa,并在进一步压缩到$62.6$ GPa时是强大的。在加压的$\mathrm{Ta}_2 \mathrm{PdSe}_6$中估计的上临界场$μ_0 H_{\mathrm{c} 2}(0)$远低于泡利极限场,与其同构类似物$M_2 \mathrm{Pd}_{\mathrm{x}} X_5$ $(M=\mathrm{Nb}$,Ta; $X=\mathrm{S}, \mathrm{Se})$的情况相反。伴随着超导现象的出现,我们观察到了与压力相关的输运性质的异常,包括霍尔系数的符号反转、电阻的异常增强和磁阻的显著抑制。同时,室温同步辐射X射线衍射实验揭示了压缩后的原始单斜结构(空间群$C 2 / m$)的稳定性。结合密度泛函理论计算,我们认为压力诱导的Lifshitz跃迁可能是$\mathrm{Ta}_2 \mathrm{PdSe}_6$中突现超导电性的电子起源.

英文摘要:

Here we report the discovery of pressure-induced superconductivity in quasi-one-dimensional $\mathrm{Ta}_2 \mathrm{PdSe}_6$, through a combination of electrical transport, synchrotron x-ray diffraction, and theoretical calculations. Our transport measurements show that the superconductivity appears at a critical pressure $P_{\mathrm{c}} \sim 18.3$ GPa and is robust upon further compression up to $62.6$ GPa. The estimated upper critical field $μ_0 H_{\mathrm{c} 2}(0)$ in the pressurized $\mathrm{Ta}_2 \mathrm{PdSe}_6$ is much lower than the Pauli limiting field, in contrast to the case in its isostructural analogs $M_2 \mathrm{Pd}_{\mathrm{x}} X_5$ $(M=\mathrm{Nb}$, Ta; $X=\mathrm{S}, \mathrm{Se})$. Concomitant with the occurrence of superconductivity, anomalies in pressuredependent transport properties are observed, including sign reversal of Hall coefficient, abnormally enhanced resistance, and dramatically suppressed magnetoresistance. Meanwhile, room-temperature synchrotron x-ray diffraction experiments reveal the stability of the pristine monoclinic structure (space group $C 2 / m$ ) upon compression. Combined with the density functional theory calculations, we argue that a pressure-induced Lifshitz transition could be the electronic origin of the emergent superconductivity in $\mathrm{Ta}_2 \mathrm{PdSe}_6$.

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