在中等压力下实现高超导性质的四级La-Y-Ce化物
Su Chen1, Yulong Wang1, Fuquan Bai2
1State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
Journal of the American Chemical Society
|May 8, 2024
概括
研究人员开发了新的四级La-Y-Ce化物,其超导率高达190K. 这一高温超导体的突破表明了增强的临界磁场和电流密度,为未来的应用铺平了道路.
科学领域:
- 材料科学
- 凝聚物质物理学
- 超导性
背景情况:
- 化物超导体是正在进行的高温超导革命的核心.
- 多元化物是发现新型超导材料的关键平台.
- 实现高超导过渡温度 (Tc),临界磁场 (μ0Hc2) 和临界电流密度 (Jc) 对于实际应用至关重要.
研究的目的:
- 合成具有增强超导性能的新型四级La-Y-Ce化物.
- 研究"工程"对化物超导体稳定性和性能的影响.
- 探索多组件化物的潜力,以实现高温超导.
主要方法:
- 在中等压力下使用"工程"合成四级La-Y-Ce化物.
- 测量电阻的温度依赖性以确认超导性.
- 超导特性,包括过渡温度 (Tc),上临界磁场 (μ0Hc2) 和临界电流密度 (Jc).
主要成果:
- 在112 GPa下成功合成Fm3m- ((La,Y,Ce) H10的超导率高达Tc~190 K.
- 观察到异常的超导特性:μ0Hc2(0) 达到292 T,Jc(0) > 4.61 × 10^7 A/cm^2.
- 与二元化物相比, (La,Y,Ce) H10中的Fm3m结构在相对较低的压力下表现出稳定性.
结论:
- 多组件化物通过"工程"显著增强超导特性,并在较低的压力下稳定超导相.
- 这项工作鼓励对多超导体进行进一步的实验研究.
- 这些发现为正在进行的在各种化物材料中寻找室温超导体提供了宝贵的参考.
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