Guo Jianning, Semenok Dmitrii, Shutov Grigoriy, Zhou Di, Chen Su, Wang Yulong, Zhang Kexin, Wu Xinyue, Luther Sven, Helm Toni, Huang Xiaoli, Cui Tian
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
Center for High Pressure Science and Technology Advanced Research (HPSTAR), Department of High-Temperature Superconductivity, Beijing 100193, China.
Natl Sci Rev. 2024 Apr 18;11(12):nwae149. doi: 10.1093/nsr/nwae149. eCollection 2024 Dec.
Hydride superconductors continue to fascinate the communities of condensed matter physics and material scientists because they host the promising near room-temperature superconductivity. Current research has concentrated on the new hydride superconductors with the enhancement of the superconducting transition temperature ( ). The multiple extreme conditions (high pressure/temperature and magnetic field) will introduce new insights into hydride superconductors. The study of transport properties under very high magnetic fields facilitates the understanding of superconductivity in conventional hydride superconductors. In the present work, we report experimental evidence of an unusual metal state in a newly synthesized cubic A15-type LaH that exhibits superconductivity with a reaching 105 K at 118 GPa. A large negative magnetoresistance is observed in strong pulsed magnetic fields in the non-superconducting state of this compound below 40 K. Moreover, we construct the full magnetic phase diagram of LaH up to 68 T at high pressure. The present work reveals anomalous electronic structural properties of A15-LaH under high magnetic fields, and therefore has great importance with regard to advancing the understanding of quantum transport behaviors in hydride superconductors.
氢化物超导体继续吸引着凝聚态物理和材料科学家群体，因为它们展现出了颇具前景的近室温超导性。当前的研究集中在新型氢化物超导体以及超导转变温度（ ）的提升上。多种极端条件（高压/高温和磁场）将为氢化物超导体带来新的见解。对极高磁场下输运性质的研究有助于理解传统氢化物超导体中的超导性。在本工作中，我们报告了新合成的立方A15型LaH中一种异常金属态的实验证据，该化合物在118 GPa时展现出超导转变温度达到105 K的超导性。在低于40 K的该化合物非超导态的强脉冲磁场中观察到了大的负磁阻。此外，我们构建了高压下高达68 T的LaH完整磁相图。本工作揭示了高压下A15-LaH异常的电子结构性质，因此对于推进对氢化物超导体中量子输运行为的理解具有重要意义。
