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arXiv 2602.24028cond-mat.supr-concond-mat.mtrl-sci
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A15型V3(Os1-2xSixGex)中熵合金的超导性

Superconductivity in the A15-type V3(Os1-2xSixGex) medium-entropy alloys

Sun Yat-sen University(中山大学)

Yucheng Li, Kuan Li, Lingyong Zeng, Rui Chen, Jingjun Qin, Shuangyue Wang, Huixia Luo

AI总结:

研究通过等离子体熔融法设计A15型V3(Os1-2xSixGex)中熵超导体,发现其超导转变温度随Os浓度降低而上升,并表现出超过Pauli极限的临界磁场,揭示了自旋轨道耦合对磁场鲁棒性的影响。

摘要:

立方A15型超导合金一直吸引学术界和工业界,因为它们主要支持低温超导应用的最大市场,并表现出奇特的物理性质。中熵/高熵合金(MEAs-HEAs)由于其高机械硬度和优异的辐射耐受性,可以在极端条件下稳定工作。结合A15型超导体和MEAs-HEAs的特点,我们设计了一系列此前未报告的A15型V3(Os1-2xSixGex)(x = 0.333, 0.375, 0.425)中熵超导体,可通过等离子体熔融法获得。电阻率、磁化率和比热测量表明,所有材料均为II型 bulk 超导体。超导转变温度(Tc)随着Os浓度的系统性减少而呈上升趋势。此外,V3(Os0.333Si0.333Ge0.333)样品的临界磁场大于Pauli极限,表明其可能由于重Os原子引起的自旋轨道耦合而对磁场具有鲁棒性。这些发现不仅推进了熵稳定A15型合金中新兴现象的理解,也扩展了新超导体的成员。

英文摘要:

Cubic A15-type superconducting alloys continue to fascinate the academic and industrial fields because they mainly support the largest market for low-temperature superconducting applications and show exotic physical properties. Medium-/high-entropy alloys (MEAs-HEAs) can be employed stably under extreme conditions due to their high mechanical hardness and excellent irradiation tolerance. Combining with the features of the A15-type superconductor and MEAs-HEAs, we design a series of previously unreported A15-type V3(Os1-2xSixGex) (x = 0.333, 0.375, 0.425) MEA superconductors, which can be obtained by an arc melting method. Resistivity, magnetic susceptibility, and specific heat measurements indicate that all of them are type-II bulk superconductors. The superconducting transition temperature (Tc) exhibits an upward trend with the systematic reduction of Os concentration. Additionally, the upper critical field of the V3(Os0.333Si0.333Ge0.333) sample is larger than the Pauli limit, suggesting it may be robust against magnetic fields due to spin-orbit coupling induced by the heavy Os atoms. These findings not only advance our understanding of emergent phenomena in entropy-stabilized A15-type alloys but also expand the members of new superconductors.

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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