Revisit of the anisotropic vortex states of 2H-NbSe2 towards the zero-field limit

张凡 ¹侯兴元 ²姜宇轩 ³张宗源 ⁴涂玉兵 ⁴朱相德 ⁵陈根富 ¹单磊⁶

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作者信息

1. Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China
2. Center of Free Electron Laser and High Magnetic Field,Anhui University,Hefei 230601,China;Information Materials and Intelligent Sensing Laboratory of Anhui Province,Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China;Key Laboratory of Structure and Functional Regulation of Hybrid Materials in Anhui University,Ministry of Education,Hefei 230601,China
3. School of Physics and Materials Science,Anhui University,Hefei 230601,China;Center of Free Electron Laser and High Magnetic Field,Anhui University,Hefei 230601,China
4. Information Materials and Intelligent Sensing Laboratory of Anhui Province,Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China;Key Laboratory of Structure and Functional Regulation of Hybrid Materials in Anhui University,Ministry of Education,Hefei 230601,China
5. Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory,HFIPS,Anhui,Chinese Academy of Sciences,and University of Science and Technology of China,Hefei 230031,China
6. Center of Free Electron Laser and High Magnetic Field,Anhui University,Hefei 230601,China;Information Materials and Intelligent Sensing Laboratory of Anhui Province,Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China;Key Laboratory of Structure and Functional Regulation of Hybrid Materials in Anhui University,Ministry of Education,Hefei 230601,China;Hefei National Laboratory,Hefei 230088,China
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Abstract

We revisited the vortex states of 2H-NbSe2 towards zero fields by a low-temperature scanning tunneling microscope.Fine structures of the anisotropic vortex states were distinguished,one is a spatially non-splitting zero bias peak,and the other is an in-gap conductance anomaly resembling evolved crossing features around the center of the three nearest vortices.Both of them distribute solely along the next nearest neighboring direction of the vortex lattice and become unresolved in much higher magnetic fields,implying an important role played by the vortex-vortex interactions.To clarify these issues,we have studied the intrinsic vortex states of the isolated trapped vortex in zero fields at 0.45 K.It is concluded that the anisotropic zero bias peak is attributed to the superconducting gap anisotropy,and the spatially evolved crossing features are related to the vortex-vortex interaction.The vortex core size under the zero-field limit is determined.These results provide a paradigm for studying the inherent vortex states of type-Ⅱ superconductors especially based on an isolated vortex.

Key words

vortex states/zero-bias conductance peak/scanning tunneling microscopy

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基金项目

国家重点研发计划(2022YFA1403203)

Innovation Program for Quantum Science and Technology(2021ZD0302802)

国家自然科学基金(12074002)

国家自然科学基金(12374133)

国家自然科学基金(11804379)

Major Basic Program of Natural Science Foundation of Shandong Province(ZR2021ZD01)

国家自然科学基金(12274001)

安徽省自然科学基金(2208085MA09)

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

参考文献量54

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