Anisotropy of 2H-NbSe2 in the superconducting and charge density wave states
Chi Zhang(张驰)1,2,4,5, Shan Qiao(乔山)1,4,5, Hong Xiao(肖宏)3, and Tao Hu(胡涛)2,†
1 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China; 2 Beijing Academy of Quantum Information Sciences, Beijing 100193, China; 3 Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China; 4 CAS Center for Excellence in Superconducting Electronics(CENSE), Shanghai 200050, China; 5 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract Anisotropy is an important feature of layered materials, and a large anisotropy is usually related to the two-dimensional characteristics. We investigated the anisotropy of the layered transition metal dicalcogenide 2H-NbSe in the superconducting and charge density wave (CDW) states using magnetotransport measurements. In the superconducting state, the normalized is independent of the thickness of 2H-NbSe, while increases significantly with decreasing thickness, where is the Pauli limiting magnetic field and and are the upper critical fields in the and directions, respectively. It is found that the superconducting anisotropy parameter increases with reduction in the thickness of 2H-NbSe. In the CDW state, the angular () dependence of magnetoresistance, scales with , which decreases with increasing temperature and disappears at about 40 K. It is found that the CDW anisotropy parameter is much larger than the effective mass anisotropy but does not change a lot for ultrathin and bulk samples. Our results suggest the existence of three-dimensional superconductivity and quasi-two dimensional CDWs in bulk 2H-NbSe.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11574338 and 12074038) and NSAF (Grant No. U1530402).
Corresponding Authors:
Tao Hu
E-mail: hutao@baqis.ac.cn
Cite this article:
Chi Zhang(张驰), Shan Qiao(乔山), Hong Xiao(肖宏), and Tao Hu(胡涛) Anisotropy of 2H-NbSe2 in the superconducting and charge density wave states 2023 Chin. Phys. B 32 047201
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