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arXiv 2105.04777cond-mat.supr-con
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TiGeTe $_{6}$中的压致超导

Pressure-induced superconductivity in TiGeTe$_{6}$

Sayaka Yamamoto, Ryo Matsumoto, Shintaro Adachi, Kensei Terashima, Hiromi Tanaka, Tetsuo Irifune, Hiroyuki Takeya, Yoshihiko Takano

摘要:

层状三元过渡金属硫属化合物是超导材料研究的热点。在这项研究中,TiGeTe $_{6}$单晶的合成和结构和价态分析和电输运测量的特点。在高达71 GPa的各种压力下测量了输运性质。活化能随着施加的压力的增加而变小,并且在约8.4GPa下观察到压力诱导金属化的特征。在13 GPa压力下,首次发现了该化合物的压力诱导超导性,在3 K和6 K时电阻连续下降,表明存在多个超导转变。超导转变温度保持增加,因为我们进一步施加压力的TiGeTe $_{6}$单晶在所执行的压力范围内,达到高达8.1 K下71 GPa。

英文摘要:

Layered ternary transition-metal chalcogenides have been focused as a vein of exploration for superconductors. In this study, TiGeTe$_{6}$ single crystals were synthesized and characterized by structural and valence state analyses and electrical transport measurements. The transport properties were measured under various pressures up to 71 GPa. The activation energy gets smaller as the applied pressure increases, and a signature of a pressure-induced metallization was observed under around 8.4 GPa. Under 13 GPa, pressure-induced superconductivity was discovered in this compound for the first time, with successive drops at 3 K and 6 K in the resistance, indicating the presence of multiple superconducting transitions. The superconducting transition temperature kept increasing as we further applied the pressure to the TiGeTe$_{6}$ single crystal in the performed pressure range, reaching as high as 8.1 K under 71 GPa.

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