Magnetoresistance of the superconducting and 'stripe' phases at EuO/KTO (111) interfaces.
ORAL
Abstract
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.
*All work was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The use of facilities at the Center for Nanoscale Materials was supported by the US DOE, Basic Energy Sciences under Contract No. DE-AC02-06CH11357.
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Presenters
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Anand Bhattacharya
- Argonne National Laboratory
- Materials Science Division, Argonne National Laboratory
- Materials Science Division, Argonne National Lab