气候变化领域集成服务门户(CCPortal): Evidence for nematic superconductivity of topological surface states in PbTaSe2

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DOI	10.1016/j.scib.2020.04.039
	Evidence for nematic superconductivity of topological surface states in PbTaSe2
	Le T.; Sun Y.; Jin H.-K.; Che L.; Yin L.; Li J.; Pang G.; Xu C.; Zhao L.; Kittaka S.; Sakakibara T.; Machida K.; Sankar R.; Yuan H.; Chen G.; Xu X.; Li S.; Zhou Y.; Lu X.
发表日期	2020
ISSN	20959273
起始页码	1349
结束页码	1355
卷号	65 期号:16
英文摘要	Spontaneous symmetry breaking has been a paradigm to describe the phase transitions in condensed matter physics. In addition to the continuous electromagnetic gauge symmetry, an unconventional superconductor can break discrete symmetries simultaneously, such as time reversal and lattice rotational symmetry. In this work we report a characteristic in-plane 2-fold behaviour of the resistive upper critical field and point-contact spectra on the superconducting semimetal PbTaSe2 with topological nodal-rings, despite its hexagonal lattice symmetry (or D3h in bulk while C3v on surface, to be precise). The 2-fold behaviour persists up to its surface upper critical field Hc2R even though bulk superconductivity has been suppressed at its bulk upper critical field Hc2HC≪Hc2R, signaling its probable surface-only electronic nematicity. In addition, we do not observe any lattice rotational symmetry breaking signal from field-angle-dependent specific heat within the resolution. It is worth noting that such surface-only electronic nematicity is in sharp contrast to the observation in the topological superconductor candidate, CuxBi2Se3, where the nematicity occurs in various bulk measurements. In combination with theory, superconducting nematicity is likely to emerge from the topological surface states of PbTaSe2, rather than the proximity effect. The issue of time reversal symmetry breaking is also addressed. Thus, our results on PbTaSe2 shed new light on possible routes to realize nematic superconductivity with nontrivial topology. © 2020 Science China Press
关键词	Nematic superconductivity Point-contact spectroscopy Topological superconductor Topological surface states
英文关键词	Crystal lattices; Lead compounds; Point contacts; Specific heat; Superconducting materials; Surface states; Tantalum compounds; Topology; Bulk superconductivity; Field-angle-dependent; Point contact spectra; Rotational symmetries; Spontaneous symmetry breaking; Time reversal symmetries; Unconventional superconductors; Upper critical fields; Selenium compounds
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207087
作者单位	Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou, 310058, China; Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara, 252-5258, Japan; Department of Physics, Zhejiang University, Hangzhou, 310027, China; Department of Applied Physics, Zhejiang University of Technology, Hangzhou, 310023, China; Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China; Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan; Department of Physics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan; Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, China; Zhejiang Province Key Laboratory of Quantum Technology and Device, Zhejiang University, Hangzhou, 310027, China; Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China; Collaborative Innovation Center of Quantum Matter, Beijing, 10...
推荐引用方式 GB/T 7714	Le T.,Sun Y.,Jin H.-K.,et al. Evidence for nematic superconductivity of topological surface states in PbTaSe2[J],2020,65(16).
APA	Le T..,Sun Y..,Jin H.-K..,Che L..,Yin L..,...&Lu X..(2020).Evidence for nematic superconductivity of topological surface states in PbTaSe2.Science Bulletin,65(16).
MLA	Le T.,et al."Evidence for nematic superconductivity of topological surface states in PbTaSe2".Science Bulletin 65.16(2020).