Violation of Pauli Limit at KTaO3(110) Interfaces

TL;DR

This study investigates the superconducting properties of LaMnO3/KTaO3 interfaces, revealing that despite orientation differences, the critical field exceeds the Pauli limit and remains unaffected by interface orientation, indicating robust superconductivity.

Contribution

The paper demonstrates that interface orientation does not influence the ratio of critical to Pauli limiting fields in KTaO3 interfaces, highlighting orientation-independent robustness of superconductivity.

Findings

Superconductivity at KTaO3 interfaces is highly resilient against in-plane magnetic fields.

The ratio of critical field to Pauli limit is unaffected by interface orientation.

Superconductivity remains robust despite variations in critical temperature due to orientation.

Abstract

The superconducting order parameter at the KTaO3 interfaces and its dependence on interface orientation remains a subject of debate. The superconductivity at these interfaces exhibits strong resilience against in-plane magnetic field and violates Pauli limit. The interface orientation dependence of critical field and violation of Pauli limit, however, have not been investigated. To address this problem, we grew epitaxial LaMnO3/KTaO3 heterostructures using molecular beam epitaxy. We show that superconductivity is extremely robust against the in-plane magnetic field. Our results indicate that the interface orientation, despite impacting the critical temperature, does not affect the ratio of critical field to the Pauli limiting field. These results offer opportunities to engineer superconductors which are resilient against magnetic field.