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

doi:10.1088/1674-1056/ad362d

中国物理B ›› 2024, Vol. 33 ›› Issue (6): 67401-067401.doi: 10.1088/1674-1056/ad362d

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

Fan Zhang(张凡)^1,2, Xingyuan Hou(侯兴元)^3,4,5,†, Yuxuan Jiang(姜宇轩)^6,3,‡, Zongyuan Zhang(张宗源)^4,5, Yubing Tu(涂玉兵)^4,5, Xiangde Zhu(朱相德)⁷, Genfu Chen(陈根富)^1,2, and Lei Shan(单磊)^3,4,5,8,§

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
3 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;
5 Key Laboratory of Structure and Functional Regulation of Hybrid Materials in Anhui University, Ministry of Education, Hefei 230601, China;
6 School of Physics and Materials Science, Anhui University, Hefei 230601, China;
7 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;
8 Hefei National Laboratory, Hefei 230088, China

收稿日期:2024-02-18 修回日期:2024-03-11 接受日期:2024-03-21 出版日期:2024-06-18 发布日期:2024-06-18
通讯作者: Xingyuan Hou, Yuxuan Jiang, Lei Shan E-mail:xyhou@ahu.edu.cn;yuxuan.jiang@ahu.edu.cn;lshan@ahu.edu.cn
基金资助:
Project supported by the National Key R&D Program of China (Grant No. 2022YFA1403203), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302802), the National Natural Science Foundation of China (Grant Nos. 12074002, 12374133, and 11804379), and the Major Basic Program of Natural Science Foundation of Shandong Province (Grant No. ZR2021ZD01). Y. J. acknowledges the supports of the National Natural Science Foundation of China (Grant No. 12274001) and the Natural Science Foundation of Anhui Province (Grant No. 2208085MA09).

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

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
3 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;
5 Key Laboratory of Structure and Functional Regulation of Hybrid Materials in Anhui University, Ministry of Education, Hefei 230601, China;
6 School of Physics and Materials Science, Anhui University, Hefei 230601, China;
7 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;
8 Hefei National Laboratory, Hefei 230088, China

Received:2024-02-18 Revised:2024-03-11 Accepted:2024-03-21 Online:2024-06-18 Published:2024-06-18
Contact: Xingyuan Hou, Yuxuan Jiang, Lei Shan E-mail:xyhou@ahu.edu.cn;yuxuan.jiang@ahu.edu.cn;lshan@ahu.edu.cn
Supported by:
Project supported by the National Key R&D Program of China (Grant No. 2022YFA1403203), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302802), the National Natural Science Foundation of China (Grant Nos. 12074002, 12374133, and 11804379), and the Major Basic Program of Natural Science Foundation of Shandong Province (Grant No. ZR2021ZD01). Y. J. acknowledges the supports of the National Natural Science Foundation of China (Grant No. 12274001) and the Natural Science Foundation of Anhui Province (Grant No. 2208085MA09).

摘要/Abstract

摘要： We revisited the vortex states of 2H-NbSe$_{2}$ 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 0.45K. 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-I\!I superconductors especially based on an isolated vortex.

关键词: vortex states, zero-bias conductance peak, scanning tunneling microscopy

Abstract: We revisited the vortex states of 2H-NbSe$_{2}$ 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 0.45K. 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-I\!I superconductors especially based on an isolated vortex.

Key words: vortex states, zero-bias conductance peak, scanning tunneling microscopy

中图分类号: (Magnetic properties including vortex structures and related phenomena)

74.25.Ha

74.55.+v (Tunneling phenomena: single particle tunneling and STM) 47.32.cb (Vortex interactions)

Fan Zhang(张凡), Xingyuan Hou(侯兴元), Yuxuan Jiang(姜宇轩), Zongyuan Zhang(张宗源), Yubing Tu(涂玉兵), Xiangde Zhu(朱相德), Genfu Chen(陈根富), and Lei Shan(单磊). Revisit of the anisotropic vortex states of 2H-NbSe₂ towards the zero-field limit[J]. 中国物理B, 2024, 33(6): 67401-067401.

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

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

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