Planar Hall effect and anisotropic magnetoresistance in polar-polar interface of LaVO3-KTaO3 with strong spin-orbit coupling

Neha Wadehra, Ruchi Tomar, Rahul Mahavir Varma, R. K. Gopal, Yogesh Singh, Sushanta Dattagupta and S. Chakraverty ()
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Neha Wadehra: Institute of Nano Science and Technology
Ruchi Tomar: Institute of Nano Science and Technology
Rahul Mahavir Varma: Indian Institute of Science
R. K. Gopal: Indian Institute of Science Education and Research Mohali
Yogesh Singh: Indian Institute of Science Education and Research Mohali
Sushanta Dattagupta: Bose Institute
S. Chakraverty: Institute of Nano Science and Technology

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Among the perovskite oxide family, KTaO3 (KTO) has recently attracted considerable interest as a possible system for the realization of the Rashba effect. In this work, we report a novel conducting interface by placing KTO with another insulator, LaVO3 (LVO) and report planar Hall effect (PHE) and anisotropic magnetoresistance (AMR) measurements. This interface exhibits a signature of strong spin-orbit coupling. Our experimental observations of two fold AMR and PHE at low magnetic fields (B) is similar to those obtained for topological systems and can be intuitively understood using a phenomenological theory for a Rashba spin-split system. Our experimental data show a B2 dependence of AMR and PHE at low magnetic fields that could also be explained based on our model. At high fields (~8 T), we see a two fold to four fold transition in the AMR that could not be explained using only Rashba spin-split energy spectra.

Date: 2020
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DOI: 10.1038/s41467-020-14689-z

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