Superconductivity and Fermi-surface nesting in the candidate Dirac semimetal NbC

Superconductivity and Fermi-surface nesting in the candidate Dirac semimetal NbC
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候选狄拉克半金属 NbC 中的超导性和费米面嵌套

DOI:
10.1103/physrevb.102.205117
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发表时间:
2020-10
期刊:
影响因子:
3.7
通讯作者:
Feng Baojie
Feng Baojie
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yan Dayu;Geng Daiyu;Gao Qiang;Cui Zhihai;Yi Changjiang;Feng Ya;Song Chunyao;Luo Hailan;Yang Meng;Arita Masashi;Kumar Shiv;Schwier Eike F.;Shimada Kenya;Zhao Lin;Wu Kehui;Weng Hongming;Chen Lan;Zhou X. J.;Wang Zhijun;Shi Youguo;Feng Baojie

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我们报道了一种具有各种特殊性质的过渡金属碳化物NbC单晶的合成。输运、磁化率和比热测量表明,NbC是一种超导转变温度为11.5K的常规超导体。我们的理论计算表明,NbC是一种具有很强费米表面嵌套的II型Dirac半金属,这与我们的角分辨光电子能谱(ARPES)测量结果相一致。我们还用ARPES观察了NbC的超导带隙,发现了一些非常规的行为。这些有趣的超导和拓扑特性,再加上高耐腐蚀性,使NBC成为基础研究和设备应用的理想平台。
We report the synthesis of single-crystal NbC, a transition metal carbide with various unusual properties. Transport, magnetic susceptibility, and specific heat measurements demonstrate that NbC is a conventional superconductor with a superconducting transition temperature $({T}_{c})$ of 11.5 K. Our theoretical calculations show that NbC is a type-II Dirac semimetal with strong Fermi-surface nesting, which is supported by our angle-resolved photoemission spectroscopy (ARPES) measurement results. We also observed the superconducting gaps of NbC using ARPES and found some unconventional behaviors. These intriguing superconducting and topological properties, combined with the high corrosion resistance, make NbC an ideal platform for both fundamental research and device applications.
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