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; S Chakraverty

doi:10.1038/s41467-020-14689-z

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

Nat Commun. 2020 Feb 13;11(1):874. doi: 10.1038/s41467-020-14689-z.

Authors

Neha Wadehra¹, Ruchi Tomar¹, Rahul Mahavir Varma², R K Gopal³, Yogesh Singh³, Sushanta Dattagupta⁴, S Chakraverty⁵

Affiliations

¹ Nanoscale Physics and Device Laboratory, Institute of Nano Science and Technology, Phase-10, Sector-64, Mohali, Punjab, 160062, India.
² Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangaluru, Karnataka, 560012, India.
³ Indian Institute of Science Education and Research Mohali, Knowledge City, Sector-81, SAS Nagar, Manauli, 140306, India.
⁴ Bose Institute, P-1/12, CIT Rd, Scheme VIIM, Kankurgachi, Kolkata, West Bengal, 700054, India.
⁵ Nanoscale Physics and Device Laboratory, Institute of Nano Science and Technology, Phase-10, Sector-64, Mohali, Punjab, 160062, India. suvankar.chakraverty@gmail.com.

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.