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Title: Disentangling spin-orbit coupling and local magnetism in a quasi-two-dimensional electron system

Abstract

Quantum interference between time-reversed electron paths in two dimensions (2D) leads to the well-known weak localization correction to resistance. If spin-orbit coupling is present, the resistance correction is negative, termed weak antilocalization (WAL). Here, we report the observation of WAL coexisting with exchange coupling between itinerant electrons and localized magnetic moments. We use low-temperature magnetotransport measurements to investigate the quasi-two-dimensional, high-electron-density interface formed between SrTiO3 and the antiferromagnetic Mott insulator NdTiO3. As the magnetic field angle is gradually tilted away from the sample normal, the data reveal the interplay between strong k-cubic Rashba-type spin-orbit coupling and a substantial magnetic exchange interaction from local magnetic regions. The resulting quantum corrections to the conduction are in excellent agreement with existing models and allow sensitive determination of the small magnetic moments (22 μB on average), their magnetic anisotropy, and mutual coupling strength. Furthermore, this effect is expected to arise in other 2D magnetic materials systems.

Authors:
 [1];  [1];  [1];  [1];  [1]; ORCiD logo [1]
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  1. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1612515
Alternate Identifier(s):
OSTI ID: 1547976
Grant/Contract Number:  
SC0016371; SC-0016371
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 8; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics; Magnetism; Magnetotransport; Quantum interference effects; Spin-orbit coupling; Weak antilocalization; Complex oxides; Two-dimensional electron system

Citation Formats

Cai, Xinxin, Ayino, Yilikal, Yue, Jin, Xu, Peng, Jalan, Bharat, and Pribiag, Vlad S. Disentangling spin-orbit coupling and local magnetism in a quasi-two-dimensional electron system. United States: N. p., 2019. Web. doi:10.1103/physrevb.100.081402.
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Cai, Xinxin, Ayino, Yilikal, Yue, Jin, Xu, Peng, Jalan, Bharat, & Pribiag, Vlad S. Disentangling spin-orbit coupling and local magnetism in a quasi-two-dimensional electron system. United States. https://doi.org/10.1103/physrevb.100.081402
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Cai, Xinxin, Ayino, Yilikal, Yue, Jin, Xu, Peng, Jalan, Bharat, and Pribiag, Vlad S. Wed . "Disentangling spin-orbit coupling and local magnetism in a quasi-two-dimensional electron system". United States. https://doi.org/10.1103/physrevb.100.081402. https://www.osti.gov/servlets/purl/1612515.
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@article{osti_1612515,
title = {Disentangling spin-orbit coupling and local magnetism in a quasi-two-dimensional electron system},
author = {Cai, Xinxin and Ayino, Yilikal and Yue, Jin and Xu, Peng and Jalan, Bharat and Pribiag, Vlad S.},
abstractNote = {Quantum interference between time-reversed electron paths in two dimensions (2D) leads to the well-known weak localization correction to resistance. If spin-orbit coupling is present, the resistance correction is negative, termed weak antilocalization (WAL). Here, we report the observation of WAL coexisting with exchange coupling between itinerant electrons and localized magnetic moments. We use low-temperature magnetotransport measurements to investigate the quasi-two-dimensional, high-electron-density interface formed between SrTiO3 and the antiferromagnetic Mott insulator NdTiO3. As the magnetic field angle is gradually tilted away from the sample normal, the data reveal the interplay between strong k-cubic Rashba-type spin-orbit coupling and a substantial magnetic exchange interaction from local magnetic regions. The resulting quantum corrections to the conduction are in excellent agreement with existing models and allow sensitive determination of the small magnetic moments (22 μB on average), their magnetic anisotropy, and mutual coupling strength. Furthermore, this effect is expected to arise in other 2D magnetic materials systems.},
doi = {10.1103/physrevb.100.081402},
journal = {Physical Review B},
number = 8,
volume = 100,
place = {United States},
year = {Wed Aug 07 00:00:00 EDT 2019},
month = {Wed Aug 07 00:00:00 EDT 2019}
}
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https://doi.org/10.1103/physrevb.100.081402
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