From weak antilocalization to Kondo scattering in a magnetic complex oxide interface

Xinxin Cai; Jin Yue; Peng Xu; Bharat Jalan; Vlad S. Pribiag

doi:10.1103/PhysRevB.103.115434

From weak antilocalization to Kondo scattering in a magnetic complex oxide interface

Xinxin Cai, Jin Yue, Peng Xu, Bharat Jalan, Vlad S. Pribiag

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8 Scopus citations

Abstract

Quantum corrections to electrical resistance can serve as sensitive probes of the magnetic landscape of a material. For example, interference between time-reversed electron paths gives rise to weak localization effects, which can provide information about the coupling between spins and orbital motion, while the Kondo effect is sensitive to the presence of spin impurities. Here, we use low-temperature magnetotransport measurements to reveal a gradual transition from weak antilocalization (WAL) to Kondo scattering in the quasi-two-dimensional electron gas formed at the interface between SrTiO3 and the Mott insulator NdTiO3. This transition occurs as the thickness of the NdTiO3 layer is increased. Analysis of the Kondo scattering and WAL points to the presence of atomic-scale magnetic impurities coexisting with nanoscale magnetic regions that affect transport via a strong magnetic exchange interaction. This leads to distinct magnetoresistance behaviors that can serve as a sensitive probe of magnetic properties in two dimensions.

Original language	English (US)
Article number	115434
Journal	Physical Review B
Volume	103
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevB.103.115434
State	Published - Mar 22 2021

Bibliographical note

Funding Information:
This work was supported primarily by the Office of Naval Research under Award No. N00014-17-1-2884. Film growth and structural characterizations were funded by the U.S. Department of Energy through the University of Minnesota Center for Quantum Materials, under Grant No. DE-SC-0016371. Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation through the National Nano Coordinated Infrastructure Network (NNCI) under Award No. ECCS-2025124. Sample structural characterization was carried out at the University of Minnesota Characterization Facility, which receives partial support from NSF through the MRSEC program under Award No. DMR-2011401. The authors would like to thank Z. Jiang and X. Fu for assistance with PPMS measurements, and P. Crowell, Y. Ayino, X. Ying, and A. Gatto Lamas for valuable discussions.

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© 2021 American Physical Society.

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title = "From weak antilocalization to Kondo scattering in a magnetic complex oxide interface",

abstract = "Quantum corrections to electrical resistance can serve as sensitive probes of the magnetic landscape of a material. For example, interference between time-reversed electron paths gives rise to weak localization effects, which can provide information about the coupling between spins and orbital motion, while the Kondo effect is sensitive to the presence of spin impurities. Here, we use low-temperature magnetotransport measurements to reveal a gradual transition from weak antilocalization (WAL) to Kondo scattering in the quasi-two-dimensional electron gas formed at the interface between SrTiO3 and the Mott insulator NdTiO3. This transition occurs as the thickness of the NdTiO3 layer is increased. Analysis of the Kondo scattering and WAL points to the presence of atomic-scale magnetic impurities coexisting with nanoscale magnetic regions that affect transport via a strong magnetic exchange interaction. This leads to distinct magnetoresistance behaviors that can serve as a sensitive probe of magnetic properties in two dimensions.",

author = "Xinxin Cai and Jin Yue and Peng Xu and Bharat Jalan and Pribiag, {Vlad S.}",

note = "Funding Information: This work was supported primarily by the Office of Naval Research under Award No. N00014-17-1-2884. Film growth and structural characterizations were funded by the U.S. Department of Energy through the University of Minnesota Center for Quantum Materials, under Grant No. DE-SC-0016371. Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation through the National Nano Coordinated Infrastructure Network (NNCI) under Award No. ECCS-2025124. Sample structural characterization was carried out at the University of Minnesota Characterization Facility, which receives partial support from NSF through the MRSEC program under Award No. DMR-2011401. The authors would like to thank Z. Jiang and X. Fu for assistance with PPMS measurements, and P. Crowell, Y. Ayino, X. Ying, and A. Gatto Lamas for valuable discussions. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

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N1 - Funding Information: This work was supported primarily by the Office of Naval Research under Award No. N00014-17-1-2884. Film growth and structural characterizations were funded by the U.S. Department of Energy through the University of Minnesota Center for Quantum Materials, under Grant No. DE-SC-0016371. Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation through the National Nano Coordinated Infrastructure Network (NNCI) under Award No. ECCS-2025124. Sample structural characterization was carried out at the University of Minnesota Characterization Facility, which receives partial support from NSF through the MRSEC program under Award No. DMR-2011401. The authors would like to thank Z. Jiang and X. Fu for assistance with PPMS measurements, and P. Crowell, Y. Ayino, X. Ying, and A. Gatto Lamas for valuable discussions. Publisher Copyright: © 2021 American Physical Society.

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N2 - Quantum corrections to electrical resistance can serve as sensitive probes of the magnetic landscape of a material. For example, interference between time-reversed electron paths gives rise to weak localization effects, which can provide information about the coupling between spins and orbital motion, while the Kondo effect is sensitive to the presence of spin impurities. Here, we use low-temperature magnetotransport measurements to reveal a gradual transition from weak antilocalization (WAL) to Kondo scattering in the quasi-two-dimensional electron gas formed at the interface between SrTiO3 and the Mott insulator NdTiO3. This transition occurs as the thickness of the NdTiO3 layer is increased. Analysis of the Kondo scattering and WAL points to the presence of atomic-scale magnetic impurities coexisting with nanoscale magnetic regions that affect transport via a strong magnetic exchange interaction. This leads to distinct magnetoresistance behaviors that can serve as a sensitive probe of magnetic properties in two dimensions.

AB - Quantum corrections to electrical resistance can serve as sensitive probes of the magnetic landscape of a material. For example, interference between time-reversed electron paths gives rise to weak localization effects, which can provide information about the coupling between spins and orbital motion, while the Kondo effect is sensitive to the presence of spin impurities. Here, we use low-temperature magnetotransport measurements to reveal a gradual transition from weak antilocalization (WAL) to Kondo scattering in the quasi-two-dimensional electron gas formed at the interface between SrTiO3 and the Mott insulator NdTiO3. This transition occurs as the thickness of the NdTiO3 layer is increased. Analysis of the Kondo scattering and WAL points to the presence of atomic-scale magnetic impurities coexisting with nanoscale magnetic regions that affect transport via a strong magnetic exchange interaction. This leads to distinct magnetoresistance behaviors that can serve as a sensitive probe of magnetic properties in two dimensions.

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From weak antilocalization to Kondo scattering in a magnetic complex oxide interface

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University of Minnesota Materials Research Science and Engineering Center (DMR-2011401)

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From weak antilocalization to Kondo scattering in a magnetic complex oxide interface

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Bibliographical note

MRSEC Support

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University of Minnesota Materials Research Science and Engineering Center (DMR-2011401)

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