Quantum properties of d-wave YBa2Cu3O7-δ Josephson junction
Artikel i vetenskaplig tidskrift, 2006

We have measured the transport properties of YBa2Cu3O7-δ (YBCO) dc SQUIDs with Josephson junctions characterized by a combination of 45° [0 0 1] tilt and α [1 0 0] tilt grain boundary with α = 0°, ±10° and 45°. By increasing the component of transport in the YBCO c-axis direction (increasing values of α), the SQUIDs showed an enhanced quality factor. At the same time, for all the devices the response under an external magnetic field presented the main features of an unconventional Josephson current phase relation with a pronounced sin 2 component. Switching current measurements at low temperature (10th of mK) also revealed that the dynamics of grain boundary junction resulting from a combination of 45° [0 0 1] and 45° [1 0 0] tilt is dominated by macroscopic quantum tunnelling of the superconductive phase. The features are quite encouraging for applications of d-wave junctions in quantum circuitry.

High-critical temperature superconductor

SQUID

Macroscopic quantum tunneling

Författare

Floriana Lombardi

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Jesper Johansson

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Karin Cedergren

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Tobias Lindström

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Francesco Tafuri

Università degli Studi della Campania Luigi Vanvitelli

Evgeni Stepantsov

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Physica C: Superconductivity and its Applications

0921-4534 (ISSN)

Vol. 435 1-2 8-11

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1016/j.physc.2006.01.037

Mer information

Skapat

2017-10-06