Low-temperature magnetoresistance of (111) ( La0.3Sr0.7)(Al0.65Ta0.35)O3/SrTiO3

Bal, V. V.; Huang, Z.; Han, K.; Ariando, .; Venkatesan, T.; Chandrasekhar, V.

doi:10.1103/physrevb.99.035408

Title: Low-temperature magnetoresistance of (111) ( ${La}_{0.3} {Sr}_{0.7}) ({Al}_{0.65} {Ta}_{0.35}) O_{3} / {SrTiO}_{3}$

Journal Article · Thu Jan 03 00:00:00 EST 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.035408· OSTI ID:1609762

Bal, V. V. ^[1]; Huang, Z. ^[2]; Han, K. ^[2]; Ariando, . ^[2]; Venkatesan, T. ^[2]; Chandrasekhar, V. ^[1]

Northwestern Univ., Evanston, IL (United States)
National Univ. of Singapore (Singapore)

The two-dimensional conducting interfaces in SrTiO₃-based systems are known to show a variety of coexisting and competing phenomena in a complex phase space. Magnetoresistance measurements, which are typically used to extract information about the various interactions in these systems, must be interpreted with care, since multiple interactions can contribute to the resistivity in a given range of magnetic field and temperature. Here we review all the phenomena that can contribute to transport in SrTiO₃-based conducting interfaces at low temperatures. We apply this understanding to the perpendicular magnetoresistance data of the high-mobility system of (111) oriented (La_0.3Sr_0.7) (Al_0.65Ta_0.35)O₃ / STO heterostructures, and find an excess negative magnetoresistance contribution which cannot be explained by weak localization alone. Here, we argue that contributions from magnetic scattering as well as electron-electron interactions, combined with weak localization/antilocalization, can provide a possible explanation for the observed magnetoresistance.

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Research Organization:: Northwestern Univ., Evanston, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-06ER46346

OSTI ID:: 1609762

Alternate ID(s):: OSTI ID: 1489428

Journal Information:: Physical Review B, Vol. 99, Issue 3; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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75 CONDENSED MATTER PHYSICS
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materials science
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magnetotransport
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two-dimensional electron gas

Title: Low-temperature magnetoresistance of (111) ( La 0.3 Sr 0.7 ) ( Al 0.65 Ta 0.35 ) O 3 / SrTiO 3

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Title: Low-temperature magnetoresistance of (111) ( ${La}_{0.3} {Sr}_{0.7}) ({Al}_{0.65} {Ta}_{0.35}) O_{3} / {SrTiO}_{3}$