利用室温量子磁力计无接触探测持续超电流直接验证超导性
Direct Validation of Superconductivity through Contact-Free Detection of Persistent Supercurrents Using Room-Temperature Quantum Magnetometry
- University of Houston（休斯顿大学）
- Sam Houston State University（山荷州州立大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
该研究开发了一种室温无接触探测持续超电流的技术，可直接验证超导性，适用于高压下的微观样品，为超导的高通量筛选提供了可扩展的非侵入性方法。
AI中文摘要：
新材料的快速涌现推动了高温超导体的探索，但快速实验验证仍是关键瓶颈，尤其是针对高压下的微观样品。本文展示了通过室温无接触探测残余超电流实现一步法直接验证超导性的技术，该技术采用无制冷的光泵浦原子磁力计，探测超电流产生的与温度相关的磁场；超导转变可通过转变温度以上残余超电流产生的磁场突然消失，以及外加磁场反转时超电流方向的反转直接识别。该技术已在YBCO微晶体和REBCO带材上验证，可探测到毫米级REBCO正方形圆盘内由地球环境磁场诱导的超电流产生的皮特斯拉级磁场，也可探测到与高压金刚石对顶砧兼容的亚100微米YBCO微晶体的超电流磁场；使用铁氧体磁通引导器可实现厘米级距离的灵敏探测。该平台无需电接触、磁线圈或集成磁传感器，具有非侵入性、室温特性，为超导性的高通量筛选和验证提供了可扩展的方法。
英文摘要：
The accelerated emergence of new materials is driving the search for high temperature superconductors, but rapid experimental validation remains a critical bottleneck, particularly for microscopic samples under high pressure. Here, we demonstrate one-step direct superconductivity validation through room-temperature, contact-free detection of remnant supercurrents. The technique utilizes a cryogen-free optically pumped atomic magnetometer to detect the temperature-dependent magnetic field produced by supercurrents of a superconductor. The superconducting transition is directly identified by the abrupt disappearance of magnetic field from the remnant supercurrent above the transition temperature and the reversal of the supercurrent direction upon reversing the applied magnetic field. Validated on YBCO microcrystals and REBCO tape, this technique detects pico-Tesla magnetic fields from supercurrents induced by the ambient Earth's magnetic field in a millimeter-sized REBCO square disk, as well as from sub-100 micrometer YBCO microcrystals compatible with high-pressure diamond anvil cells. The use of a ferrite flux guide enables sensitive detection from centimeter-scale distances. Requiring no electrical contacts, magnetic coils, or integrated magnetic sensors, this non-invasive, room-temperature platform offers a scalable approach for high-throughput screening and validation of superconductivity.
