Large positive magnetoresistance in photocarrier-doped potassium tantalites

doi:10.1088/1674-1056/ac6742

中国物理B ›› 2022, Vol. 31 ›› Issue (12): 127302-127302.doi: 10.1088/1674-1056/ac6742

Large positive magnetoresistance in photocarrier-doped potassium tantalites

Rui-Shu Yang(杨睿姝), Ding-Bang Wang(王定邦), Yang Zhao(赵阳), Shuan-Hu Wang(王拴虎), and Ke-Xin Jin(金克新)^†

Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China

收稿日期:2022-02-20 修回日期:2022-04-08 接受日期:2022-04-14 出版日期:2022-11-11 发布日期:2022-11-11
通讯作者: Ke-Xin Jin E-mail:jinkx@nwpu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51572222), Key Research Project of the Natural Science Foundation of Shaanxi Province, China (Grant Nos. 2021JZ-08 and 2020JM-088), the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2021JM-041), and the Fundamental Research Funds for the Central Universities (Grant Nos. 3102017OQD074 and 310201911cx044).

Large positive magnetoresistance in photocarrier-doped potassium tantalites

Rui-Shu Yang(杨睿姝), Ding-Bang Wang(王定邦), Yang Zhao(赵阳), Shuan-Hu Wang(王拴虎), and Ke-Xin Jin(金克新)^†

Shaanxi Key Laboratory of Condensed Matter Structures and Properties and MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China

Received:2022-02-20 Revised:2022-04-08 Accepted:2022-04-14 Online:2022-11-11 Published:2022-11-11
Contact: Ke-Xin Jin E-mail:jinkx@nwpu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51572222), Key Research Project of the Natural Science Foundation of Shaanxi Province, China (Grant Nos. 2021JZ-08 and 2020JM-088), the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2021JM-041), and the Fundamental Research Funds for the Central Universities (Grant Nos. 3102017OQD074 and 310201911cx044).

1. 附件.pdf(583KB)

摘要/Abstract

摘要： We report on the high-field magnetotransport of KTaO₃ single crystals, which are a promising candidate for study in the extreme quantum limit. By photocarrier doping with 360 nm light, we observe a significant positive, non-saturating, and linear magnetoresistance at low temperatures accompanied by a decreasing Hall coefficient. When cooling down to 10 K, the magnetoresistance value of KTaO₃ (100) reaches ～ 433% at a magnetic field of 12 T. Such behavior can be attributed to all the electrons occupying only the lowest Landau level in the extreme quantum limit. Light inhomogeneity may also contribute to large linear magnetoresistance. These results provide insights into novel magnetic devices based on complex materials and add a new family of materials with positive magnetoresistance.

关键词: photocarriers, large positive magnetoresistance, extreme quantum limit

Abstract: We report on the high-field magnetotransport of KTaO₃ single crystals, which are a promising candidate for study in the extreme quantum limit. By photocarrier doping with 360 nm light, we observe a significant positive, non-saturating, and linear magnetoresistance at low temperatures accompanied by a decreasing Hall coefficient. When cooling down to 10 K, the magnetoresistance value of KTaO₃ (100) reaches ～ 433% at a magnetic field of 12 T. Such behavior can be attributed to all the electrons occupying only the lowest Landau level in the extreme quantum limit. Light inhomogeneity may also contribute to large linear magnetoresistance. These results provide insights into novel magnetic devices based on complex materials and add a new family of materials with positive magnetoresistance.

Key words: photocarriers, large positive magnetoresistance, extreme quantum limit

中图分类号: (Magnetoresistance)

73.43.Qt

73.50.Fq (High-field and nonlinear effects) 73.40.Gk (Tunneling)

Rui-Shu Yang(杨睿姝), Ding-Bang Wang(王定邦), Yang Zhao(赵阳), Shuan-Hu Wang(王拴虎), and Ke-Xin Jin(金克新). Large positive magnetoresistance in photocarrier-doped potassium tantalites[J]. 中国物理B, 2022, 31(12): 127302-127302.

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Large positive magnetoresistance in photocarrier-doped potassium tantalites

Large positive magnetoresistance in photocarrier-doped potassium tantalites

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