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Quantum magnetoresistance in the Ca-intercalated graphite superconductor CaC_6

机译：Ca嵌入石墨超导体CaC_6中的量子磁阻

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摘要

The search for exotic materials with a linear Dirac-like dispersion in the electronic structure is one of the most challenging tasks of the condensed matter community and materials science. Revealing the nature of the interplay between such a Dirac-like and superconducting states is a crucial issue for the study of fundamental physics. Here we report the experimental observations of a large linear magnetoresistance (MR) in the Ca-intercalated graphite superconductor CaC_6. A large nonsaturating MR with a magnitude as high as 244% is observed at low temperature under a magnetic field of 9 T. The magnetic field (B) dependence of MR shows a linear behavior above 3 T at low temperature, which deviates from the classical B~2 behavior, pointing to the existence of an intrinsic linear Dirac-like state. The presence of such a low-energy Dirac-like dispersion in energy band structure is confirmed qualitatively by performing first-principles calculations. These findings may pave an avenue for potential applications in magnetoelectronic sensors and for further studying the interplay between the linear Dirac-like and superconducting states in exotic materials.
机译：寻找电子结构中具有线性狄拉克样色散的奇异材料是凝聚态物质界和材料科学最具挑战性的任务之一。揭示这类狄拉克态与超导态之间相互作用的本质是研究基础物理学的关键问题。在这里，我们报告在插层式石墨超导体CaC_6中存在较大的线性磁阻（MR）的实验观察结果。在9 T的磁场下，在低温下观察到大的非饱和MR，幅度高达244％。MR的磁场（B）依赖性在低温下显示高于3 T的线性行为，这与经典B〜2行为，表明存在内在线性狄拉克样线性状态。通过执行第一性原理定性地确认了在能带结构中存在这种低能量的狄拉克样色散。这些发现可能为磁电子传感器的潜在应用以及进一步研究异质材料中的线性狄拉克态和超导态之间的相互作用铺平了道路。

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  • 来源
    《Physical review》 |2014年第21期|214522.1-214522.6|共6页
  • 作者

    Gang Mu; Qiucheng Ji; Wei Li; Xuguang Xu; Tao Hu; Da Jiang; Zhi Wang; Bo Gao; Xiaoming Xie; Mianheng Jiang;

  • 作者单位

    State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;

    State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;

    State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China,State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China;

    State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;

    State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;

    State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;

    School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;

    State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;

    State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;

    State Key Laboratory of Functional Materials for Informatics and Shanghai Center for Superconductivity, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;

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  • 正文语种 eng
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  • 关键词

    fullerenes and related materials; magnetotransport phenomena; materials for magnetotransport; landau levels; electronic structure;

    机译：富勒烯及相关物质;磁传输现象;磁运输材料;兰道水平;电子结构;

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