Magnetoresistance of the superconducting and 'stripe' phases at EuO/KTO (111) interfaces.*

The two-dimensional electron gas formed at interfaces of KTaO₃ (111) becomes superconducting at temperatures as high as 2.2 K for a range of carrier densities (see C. Liu et al., arXiv:2004.07416). In EuO/KTO (111) samples, we also find evidence for a highly anisotropic phase in transport measurements. In particular, for temperatures in between the normal and superconducting states, the resistance along the [11-2] direction is lower than in the [1-10] direction, being several times lower in the most anisotropic samples. We will present detailed measurements of magnetoresistance in these samples over a range of temperatures. Our measurements support the existence of a state where the superconductivity is spatially modulated in a 'stripe' like pattern, oriented along the [11-2] direction. We will present measurements for both in-plane and out-of-plane magnetic fields, and discuss a simple physical model based on Josephson coupling between stripes that explains some of our observations.