Microwave Response of Superconducting YBa2Cu3O7-delta Nanowire Bridges Sustaining the Critical Depairing Current: Evidence of Josephson-like Behavior
Artikel i vetenskaplig tidskrift, 2013

We have investigated the zero-field critical supercurrent of YBa2Cu3O7-delta bridges patterned from 50 nm thick films as a function of bridge width, ranging from 2 mu m to 50 nm. The critical current density monotonically increases for decreasing bridge width even for widths smaller than the Pearl length. This behavior is accounted for by considering current crowding effects at the junction between the bridge and the wider electrodes. Comparison to numerical calculations of the current distributions in our bridge geometries of various widths yields a (local) critical current density at 4.2 K of 1.3 x 10(8) Lambda/cm(2), the Ginzburg Landau depairing current density. The observation of up to 160 Shapiro-like steps in the current voltage characteristics under microwave irradiation substantiates the pristine character of our nanobridges with cross sections as small as 50 x 50 nm(2).

barriers

films

junctions

quantum phase-slip

Författare

Shahid Nawaz

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Riccardo Arpaia

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Floriana Lombardi

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 110 16 167004-

Ämneskategorier

Fysik

DOI

10.1103/PhysRevLett.110.167004

Mer information

Skapat

2017-10-07