Anisotropic 2D electron gas at KTaO₃(110) interface

Quantum confinement and strong spin-orbit coupling in two-dimensional (2D) system often give rise to exotic emergent phenomenon. In the recently discovered superconducting 2D electron gas at interfaces KTaO₃ (110) interface, we have found evidence for an in-plane Ising spin texture. For a polycrystalline ferromagnetic overlayer of EuOx on KTaO₃, we observe a highly anisotropic and hysteric magnetoresistance. The hysteric behavior in magnetoresistance is consistent with the coercivity field of magnetization in EuOx overlayer, indicating an existence of strong magnetic proximity effect between two layers. The highly anisotropic magnetoresistance persists from normal state to superconducting transition.





Funding acknowledgement: Research was supported by DOE BES, Materials Science and Engineering Division. Use of Center for Nanoscale Materials at Argonne was supported under contract number DE-AC02-06CH11357. Partial financial support was provided by the College of Arts and Sciences, University at Buffalo, SUNY.