Unusual metallic state in superconducting A15-type La_(4)H_(23)  

作　　者：Jianning Guo Dmitrii Semenok Grigoriy Shutov Di Zhou Su Chen Yulong Wang Kexin Zhang Xinyue Wu Sven Luther Toni Helm Xiaoli Huang Tian Cui 

机构地区：[1]State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun 130012,China [2]Center for High Pressure Science and Technology Advanced Research(HPSTAR),Department of High-Temperature Superconductivity,Beijing 100193,China [3]Skolkovo Institute of Science and Technology,Skolkovo Innovation Center,Computational and Data Science and Engineering,Moscow 121205,Russia [4]Hochfeld-Magnetlabor Dresden(HLD-EMFL)and Würzburg-Dresden Cluster of Excellence,Helmholtz-Zentrum Dresden-Rossendorf(HZDR),Dresden 01328,Germany [5]School of Physical Science and Technology,Ningbo University,Ningbo 315211,China

出　　处：《National Science Review》2024年第12期88-97,共10页国家科学评论(英文版)

基　　金：supported by the National Key R&D Program of China(2022YFA1405500);the National Natural Science Foundation of China(52372257 and 52072188);the Zhejiang Provincial Science and Technology Innovation Team(2021R01004);Fundamental Research Funds for the Central Universities;D.S.and D.Z.thank the National Natural Science Foundation of China(1231101238);Beijing Natural Science Foundation(IS23017)for supporting this research;supported by HLD HZDR,member of the European Magnetic Field Laboratory(EMFL).

摘　　要：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(Tc).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 La_(4)H_(23) that exhibits superconductivity with a Tc 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 La_(4)H_(23) up to 68 T at high pressure.The present work reveals anomalous electronic structural properties of A15-La_(4)H_(23) under high magnetic fields,and therefore has great importance with regard to advancing the understanding of quantum transport behaviors in hydride superconductors.

关 键 词：high-pressure SUPERCONDUCTIVITY hydrides negative magnetoresistance 

分 类 号：O469[理学—凝聚态物理]