Kavli Affiliate: Yi Zhou
| First 5 Authors: Yishuai Wang, Siyuan Hong, Wenze Pan, Yi Zhou, Yanwu Xie
| Summary:
The extremely low superfluid density and unprecedented tunability of oxide
interface superconductors provide an ideal platform for studying fluctuations
in two-dimensional superconductors. In this work, we have fabricated a
LaAlO3/KTaO3 interface superconductor patterned with a nanohoneycomb array of
insulating islands. Little-Parks-like magnetoresistance oscillations have been
observed, which are dictated by the superconducting flux quantum h/2e.
Moreover, an anomalous negative magnetoresistance (ANMR) appears under a weak
magnetic field, suggesting magnetic-field-enhanced superconductivity. By
examining their dependences on temperature, measurement current, and electrical
gating, we conclude that both phenomena are associated with superconducting
order parameter: The h/2e oscillations provide direct evidence of Cooper pair
transport; the ANMR is interpreted as a consequence of multiple connected
narrow superconducting paths with strong fluctuations.
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