中国物理B ›› 2022, Vol. 31 ›› Issue (3): 37403-037403.doi: 10.1088/1674-1056/ac3ba8

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On the origin of the anomalous sign reversal in the Hall effect in Nb thin films

Dan Zhou(周丹)1, Han-Song Zeng(曾寒松)1, Rujun Tang(汤如俊)1,†, Zhihong Hang(杭志宏)1, Zhiwei Hu(胡志伟)2, Zixi Pei(裴子玺)2, and Xinsheng Ling(凌新生)3,‡   

  1. 1 Institute for Advanced Study School of Physical Science and Technology, Soochow University, Suzhou 215006, China;
    2 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    3 Department of Physics, Brown University, Providence, Rhode Island 02912, USA
  • 收稿日期:2021-08-21 修回日期:2021-10-29 接受日期:2021-11-20 出版日期:2022-02-22 发布日期:2022-02-24
  • 通讯作者: Rujun Tang, Xinsheng Ling E-mail:tangrj@suda.edu.cn;xinsheng_ling@brown.edu
  • 基金资助:
    We are grateful to Professor X. G. Qiu for providing the Nb thin film samples. X. S. L. wishes to thank Professors P. Ao, D. E. Prober and J. Ye for helpful discussions and comments. This work was partially supported by the National Natural Science Foundation of China (Grant No. 51772200) (PI:R. J. Tang).

On the origin of the anomalous sign reversal in the Hall effect in Nb thin films

Dan Zhou(周丹)1, Han-Song Zeng(曾寒松)1, Rujun Tang(汤如俊)1,†, Zhihong Hang(杭志宏)1, Zhiwei Hu(胡志伟)2, Zixi Pei(裴子玺)2, and Xinsheng Ling(凌新生)3,‡   

  1. 1 Institute for Advanced Study School of Physical Science and Technology, Soochow University, Suzhou 215006, China;
    2 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    3 Department of Physics, Brown University, Providence, Rhode Island 02912, USA
  • Received:2021-08-21 Revised:2021-10-29 Accepted:2021-11-20 Online:2022-02-22 Published:2022-02-24
  • Contact: Rujun Tang, Xinsheng Ling E-mail:tangrj@suda.edu.cn;xinsheng_ling@brown.edu
  • Supported by:
    We are grateful to Professor X. G. Qiu for providing the Nb thin film samples. X. S. L. wishes to thank Professors P. Ao, D. E. Prober and J. Ye for helpful discussions and comments. This work was partially supported by the National Natural Science Foundation of China (Grant No. 51772200) (PI:R. J. Tang).

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摘要： We re-visit the anomalous sign reversal problem in the Hall effect of the sputtered Nb thin films. We find that the anomalous sign reversal in the Hall effect is extremely sensitive to a small tilting of the magnetic field and to the magnitude of the applied current. Large anomalous variations are also observed in the symmetric part of the transverse resistance Rxy. We suggest that the surface current loops on superconducting grains at the edges of the superconducting thin films may be responsible for the Hall sign reversal and the accompanying anomalous effects in the symmetric part of Rxy.

关键词: anomalous sign reversal, Hall effect, edge supercurrents, Aharonov—Bohm effect

Abstract: We re-visit the anomalous sign reversal problem in the Hall effect of the sputtered Nb thin films. We find that the anomalous sign reversal in the Hall effect is extremely sensitive to a small tilting of the magnetic field and to the magnitude of the applied current. Large anomalous variations are also observed in the symmetric part of the transverse resistance Rxy. We suggest that the surface current loops on superconducting grains at the edges of the superconducting thin films may be responsible for the Hall sign reversal and the accompanying anomalous effects in the symmetric part of Rxy.

Key words: anomalous sign reversal, Hall effect, edge supercurrents, Aharonov—Bohm effect

中图分类号:  (Mixed states, critical fields, and surface sheaths)

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