Improved noise performance of ultrathin YBCO Dayem bridge nanoSQUIDs
Journal article, 2017

We have fabricated YBa2Cu3O7-delta (YBCO) nano superconducting quantum interference devices (nanoSQUIDs), realized in Dayem bridge configuration, on films with thickness down to 10 nm. The devices, which have not been protected by a Au capping layer during the nanopatterning, show modulations of the critical current as a function of the externally applied magnetic field from 300 mK up to the critical temperature of the nanobridges. The absence of the Au shunting layer and the enhancement of the sheet resistance in ultrathin films lead to very large voltage modulations and transfer functions, which make these nanoSQUIDs highly sensitive devices. Indeed, by using bare YBCO nanostructures, we have revealed an upper limit for the intrinsic white flux noise level S-Phi,w(1/2) < 450 n Phi(0) Hz(-1/2).

high critical temperature superconductors

YBCO

nanobridges

nano superconducting quantum interference devices

Author

Riccardo Arpaia

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

Marco Arzeo

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

Reza Baghdadi

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

Edoardo Trabaldo

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

Floriana Lombardi

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

Thilo Bauch

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

Superconductor Science and Technology

0953-2048 (ISSN) 1361-6668 (eISSN)

Vol. 30 1

Subject Categories

Condensed Matter Physics

DOI

10.1088/0953-2048/30/1/014008

More information

Created

10/7/2017