Homogeneous superconductivity at the LaAlO3/SrTiO3 interface probed by nanoscale transport
Journal article, 2017

An interface between LaAlO3 and SrTiO3 (LAO/STO) may host two-dimensional superconductivity, strong spin-orbit coupling, and magnetic ordering. There are indications that the interfacial superconducting layer is nonhomogeneous at the nanoscale. The presence of inhomogeneities may have strong implications on the superconducting transport properties and lead to formation of weak links between superconducting regions. In this paper, we report on the temperature and magnetic field dependence of superconducting transport in single nanowires and nanorings fabricated in a LAO/STO interface. The analysis of data proves that our nanostructures behave like uniform superconducting filaments carrying a critical current close to the theoretical Ginzburg-Landau depairing limit. Furthermore, we unexpectedly find an enhancement of the critical current of LAO/STO nanowires and nanorings at low temperature when a magnetic field is applied. Our results point towards the coexistence of a homogeneous interfacial superconductivity and spatially separated magnetism at the LAO/STO interface.

Author

Alexei Kalaboukhov

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Pier Paolo Aurino

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

luca galletti

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Thilo Bauch

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Floriana Lombardi

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Dag Winkler

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Tord Claeson

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

D. Golubev

Aalto University

Physical Review B

2469-9950 (ISSN)

Vol. 96 18 184525

Areas of Advance

Nanoscience and Nanotechnology

Subject Categories

Physical Sciences

Nano Technology

DOI

10.1103/PhysRevB.96.184525

More information

Latest update

2/28/2018