Journal
APPLIED PHYSICS LETTERS
Volume 118, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/5.0049119
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Funding
- NC-State University startup funds
- U.S. National Science Foundation
- NSF [DMR-1751455]
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The study investigates the electronic interfacial coupling and structural properties of LaCrO3/KTaO3 heterostructures, revealing two distinct quantum corrections to conductivity at low temperatures: weak anti-localization and Kondo scattering.
The strong interfacial coupling at the 3d-5d transition metal-oxide interfaces has generated excitement due to the possibility of engineering a wide range of quantum phenomena and functionalities. Here, we investigate the electronic interfacial coupling and structural properties of LaCrO3/KTaO3 heterostructures. High-quality LaCrO3 films were grown on KTaO3 substrates using molecular beam epitaxy. These heterostructures show a robust two-dimensional electron gas and a metallic behavior down to liquid helium temperature. Using magnetoresistance measurements, we analyze the coupling of electronic orders between Cr 3d and Ta 5d states and observe signatures of weak anti-localization and Kondo scattering at low-temperature transport. The results provide direct evidence that a crossover (weak anti-localization to Kondo) occurs with increasing temperature as the dephasing scattering events reduce the coherence length. Our observations allow for a clear and detailed picture of two distinct quantum corrections to conductivity at low temperature.
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