s-wave superconductivity in the noncentrosymmetric W3Al2C superconductor: an NMR study

doi:10.1088/1361-648X/ac577a

	s-wave superconductivity in the noncentrosymmetric W3Al2C superconductor: an NMR study
	Tay, D.1; Shang, T.2; Qi, Y. P.3 ; Ying, T. P.4,5; Hosono, H.4; Ott, H-r 1,6; Shiroka, T.1,6
	2022-05-11
发表期刊	JOURNAL OF PHYSICS-CONDENSED MATTER (IF:2.3[JCR-2023],2.2[5-Year])
ISSN	0953-8984
EISSN	1361-648X
卷号	34 期号:19
发表状态	已发表
DOI	10.1088/1361-648X/ac577a
摘要	We report on a microscopic study of the noncentrosymmetric superconductor W3Al2C (with T (c) = 7.6 K), mostly by means of Al-27- and C-13 nuclear magnetic resonance (NMR). Since in this material the density of states at the Fermi level is dominated by the tungsten's 5d orbitals, we expect a sizeable spin-orbit coupling (SOC) effect. The normal-state electronic properties of W3Al2C resemble those of a standard metal, but with a Korringa product 1/(T (1) T) significantly smaller than that of metallic Al, reflecting the marginal role played by s-electrons. In the superconducting state, we observe a reduction of the Knight shift and an exponential decrease of the NMR relaxation rate 1/T (1), typical of s-wave superconductivity (SC). This is further supported by the observation of a small but distinct coherence peak just below T (c) in the C-13 NMR relaxation-rate, in agreement with the fully-gapped superconducting state inferred from the electronic specific-heat data well below T (c). The above features are compared to those of members of the same family, in particular, Mo3Al2C, often claimed to exhibit unconventional SC. We discuss why, despite the enhanced SOC, W3Al2C does not show spin-triplet features in its superconducting state and consider the broader consequences of our results for noncentrosymmetric superconductors in general.
关键词	noncentrosymmetric superconductors electronic correlations s-wave superconductivity NMR
URL	查看原文
收录类别	SCI ; EI ; SCIE
语种	英语
资助项目	Natural Science Foundation of Shanghai["21ZR1420500","21JC1402300"] ; Schweizerische Nationalfonds zur Forderung der Wissenschaftlichen Forschung, SNF[200021-169455] ; National Natural Science Foundation of China["U1932217",11974246] ; Science and Technology Commission of Shanghai Municipality[19JC1413900]
WOS研究方向	Physics
WOS类目	Physics, Condensed Matter
WOS记录号	WOS:000765959900001
出版者	IOP Publishing Ltd
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/162938
专题	物质科学与技术学院_PI研究组_齐彦鹏组
通讯作者	Shang, T.; Shiroka, T.
作者单位	1.Swiss Fed Inst Technol, Lab Festkorperphys, CH-8093 Zurich, Switzerland 2.East China Normal Univ, Sch Phys & Elect Sci, Key Lab Polar Mat & Devices MOE, Shanghai 200241, Peoples R China 3.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 4.Tokyo Inst Technol, Mat Res Ctr Element Strategy, Yokohama, Kanagawa 2268503, Japan 5.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China 6.Paul Scherrer Inst, CH-5232 Villigen, Switzerland
推荐引用方式 GB/T 7714	Tay, D.,Shang, T.,Qi, Y. P.,et al. s-wave superconductivity in the noncentrosymmetric W3Al2C superconductor: an NMR study[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2022,34(19).
APA	Tay, D..,Shang, T..,Qi, Y. P..,Ying, T. P..,Hosono, H..,...&Shiroka, T..(2022).s-wave superconductivity in the noncentrosymmetric W3Al2C superconductor: an NMR study.JOURNAL OF PHYSICS-CONDENSED MATTER,34(19).
MLA	Tay, D.,et al."s-wave superconductivity in the noncentrosymmetric W3Al2C superconductor: an NMR study".JOURNAL OF PHYSICS-CONDENSED MATTER 34.19(2022).