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在H6SX中预测高T超导率,低于兆巴压力下

Xinyi Gu¹, Kun Gao¹, Jian Hao¹

¹Laboratory of Quantum Functional Materials Design and Application, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China. wenwencui@jsnu.edu.cn.

Physical chemistry chemical physics : PCCP

|December 16, 2024

概括

研究人员通过用其他元素 (X) 替代硫,以创建H6SX化合物来探索对硫化 (H3S) 超导体的兴奋剂效应. 他们发现了七种新的动态稳定的超导体,其中H6SSb在较低的压力下显示出有希望的超导性.

科学领域:

凝聚物质物理学凝聚物质物理学
材料科学材料科学材料科学
超导性研究超导性研究

背景情况:

高临界温度超导体,如立方H3S,对于实际应用具有显著的兴趣.
在较低的压力下稳定超导体是广泛使用的关键挑战.
探索了兴奋剂策略,以调整已知的超导材料的特性.

研究的目的:

调查兴奋剂对H3S稳定性和超导性的影响.
合成和描述新的H6SX化合物作为潜在的低压超导体.

主要方法:

通过用各种元素 (X = Si, Ge, Sn, P, As, Sb, Te, Cl, Br, I) 取代 H3S 中一半的硫原子来计算构建 H6SX 化合物.
在高压下评估合成化合物的动态稳定性.
计算临界温度 (Tc) 和电子-声波合强度.

主要成果:

鉴定了七种新的低于200 GPa的动态稳定的超导体,包括H6SAs,H6SSb,H6SI,H6SSn,H6STe,H6SCl和H6SBr.
在200GPa时,H6SSb的临界温度 (Tc) 为91K,在40GPa时增加到115K.
电子 - 声子分析显示,电子 - 声子合涉及Sb原子和低频声子增强了超导性.

结论:

用各种元素合H3S可以导致新的稳定超导体.
剂元素 (X) 的电子阴性影响H-X键强度和超导性.
H6SSb显示出作为高温超导体的潜力,可以通过压力调整.

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