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arXiv 2409.03409cond-mat.supr-concond-mat.mtrl-sci
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利用掺硼金刚石电极金刚石对顶砧合成的Th₃P₄型In₃₋ₓS₄中20 K超导电性的出现

Emergence of Superconductivity at 20 K in Th$_3$P$_4$-type In$_{3-x}$S$_4$ Synthesized by Diamond Anvil Cell with Boron-doped Diamond Electrodes

Ryo Matsumoto, Kazuki Yamane, Terumasa Tadano, Kensei Terashima, Toru Shinmei, Tetsuo Irifune, Yoshihiko Takano

AI总结:

该研究利用配备掺硼金刚石电极的高压装置合成Th₃P₄型立方In₃₋ₓS₄亚稳相,在45 GPa下实现20 K超导,并揭示退火降低缺陷浓度可提升$T_c$,为探索高临界温度硫化物超导体提供了新途径。

摘要:

通过高压技术调控晶体结构以探索亚稳相超导体,在材料科学中为实现高临界温度($T_c$)引起了广泛关注。在本研究中,我们报道了在45 GPa下,利用一种原创设计的配备掺硼金刚石电极的金刚石对顶砧,在Th₃P₄型立方In₃₋ₓS₄的亚稳相中出现了新型超导电性,其$T_c$高达20 K;该装置能够同时进行高压合成和原位电输运测量。原位结构分析表明,In₃₋ₓS₄在40 GPa以上无需加热即可部分出现。高压退火处理诱导其完全转变为Th₃P₄型结构,且In₃₋ₓS₄中的缺陷浓度x随退火温度升高而降低。In₃₋ₓS₄的$T_c$在x = 0时达到最大值,接近20 K。电子能带计算表明,由硫和铟能带构成的高态密度位于费米能级附近的导带底部。In₃₋ₓS₄在超导硫化物中创纪录的高$T_c$将推动利用晶体结构灵活性在Th₃P₄型立方家族中进一步探索高$T_c$材料。

英文摘要:

The exploration of superconductors in metastable phases by manipulating crystal structures through high-pressure techniques has attracted significant interest in materials science to achieve a high critical temperature ($T_c$). In this study, we report an emergence of novel superconductivity in a metastable phase of Th$_3$P$_4$-type cubic In$_{3-x}$S$_4$ with remarkably high $T_c$ at 20 K under 45 GPa by using an originally designed diamond anvil cell equipped with boron-doped diamond electrodes, which can perform a high-pressure synthesis and an in-situ electrical transport measurement simultaneously. In-situ structural analysis indicates that the In$_{3-x}$S$_4$ appears partially above 40 GPa without heating. The high-pressure annealing treatment induces complete transformation to the Th$_3$P$_4$-type structure, and the defected concentration of x in In$_{3-x}$S$_4$ decreases with increasing annealing temperature. The $T_c$ in In$_{3-x}$S$_4$ is maximized at x = 0 and approaches 20 K. Electronic band calculations show that the high density of states composed of sulfur and indium bands are located at the conduction band bottom near Fermi energy. The record high $T_c$ in In$_{3-x}$S$_4$ among superconducting sulfides accelerates the further exploration of high $T_c$ materials within the Th$_3$P$_4$-type cubic family by using flexibility in crystal structure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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