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arXiv 2602.23675cond-mat.supr-con
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镁铁氢7的高压稳定:接近高温超导性的结构接近

High-pressure stabilization of Mg2IrH7: Structural proximity to high-Tc superconductivity

Carnegie Institution for Science(卡内基科学机构);University of Cambridge(剑桥大学);Tohoku University(东北大学);Texas Center for Superconductivity at the University of Houston(休斯顿大学超导中心)
Shubham Sinha, Wencheng Lu, Mads F. Hansen, Michael J. Hutcheon, Trevor W. Bontke, Lewis J. Conway, Kapildeb Dolui, Chris J. Pickard, Christoph Heil, Piotr A. G… 展开作者

Shubham Sinha, Wencheng Lu, Mads F. Hansen, Michael J. Hutcheon, Trevor W. Bontke, Lewis J. Conway, Kapildeb Dolui, Chris J. Pickard, Christoph Heil, Piotr A. Guńka, Stella Chariton, Vitali Prakapenka, Liangzi Deng, Ching-Wu Chu, Matthew N. Julian, Rohit P. Prasankumar, Timothy A. Strobel

AI总结:

研究通过高压稳定Mg₂IrH₇并发现其与高温超导性相关的结构接近,揭示了非平衡处理路径获取超导Mg₂IrH₆的可能性。

摘要:

Mg₂IrH₆是一种亚稳态金属氢化物,其预测的超导转变温度在常压下可高达170 K。在低压力下合成了同质的绝缘Mg₂IrH₅后,进一步进行了高压研究,以调查该系统的相变行为和化合物形成。X射线衍射和拉曼光谱测量表明,立方Mg₂IrH₇在约40 GPa以上被稳定,并与可能组成接近Mg₂IrH₅的六方氢化物共存。电输运测量显示,立方Mg₂IrH₇是绝缘的,与ab initio预测一致,并在室温分解直至约20 GPa后恢复为立方Mg₂IrH₅。实验结果证实了Mg-Ir-H系统中的基态结构预测,并且形成两个几乎相同的相,其周围组成打开了通过非平衡处理路径获得超导Mg₂IrH₆的新机会。

英文摘要:

Mg$_2$IrH$_6$ is a metastable complex metal hydride with a predicted superconducting transition temperature as high as 170 K at ambient pressure. Following the synthesis of isomorphic, insulating Mg$_2$IrH$_5$ at low pressure, higher-pressure studies were conducted to investigate the phase behavior and compound formation in this system. X-ray diffraction and Raman spectroscopic measurements indicate that cubic Mg$_2$IrH$_7$ is stabilized above ca. 40 GPa and coexists with a related hexagonal hydride with likely composition near Mg$_2$IrH$_5$. Electrical transport measurements show that the cubic Mg$_2$IrH$_7$ is insulating, in agreement with ab initio predictions, and persists during room-temperature decompression until $\sim$20 GPa before reverting back to the cubic Mg$_2$IrH$_5$. The experimental results confirm ground-state structure predictions in the Mg-Ir-H system, and the formation of two nearly identical phases with surrounding compositions opens new opportunities to access superconducting Mg$_2$IrH$_6$ through non-equilibrium processing pathways.

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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