Danish Ph.D. School in Nonlinear Science

Sponsored by the Danish Research Academy

Intrinsic Josephson Junctions in High Temperature Superconductors

by Reinhold Kleiner
Physikalisches Institut III
Universität Erlangen-Nürnberg
Erwin-Rommel-Str. 1
D-91058 Erlangen
Phone: +49 9131 85-7408
Fax: +49 9131 15249
e-mail: kleiner@physik.uni-erlangen.de

MIDIT-seminar No. 401

Thursday, March 12th, 1998 15:15 h
at MIDIT, IMM Building 305, room 027

Abstract: Many high temperature superconductors form natural superconducting multilayers where adjacent layers are coupled by the Josephson effect. As a result, suitably patterned structures act intrinsically as strongly coupled stacks of Josephson junctions. The presentation is intended to give an overview on the preset state of knowledge, including recent experiments at THz-frequencies, observations of Cherenkov radiation by moving Josephson vortices, observations of the collective Josephson plasma resonance and the appearance of subgap structures in the current-voltage characteristic of intrinsic Josephson junctions. We will show that the subgap structures are most likely due to interactions between c-axis phonons and the electric fields generated by the ac Josephson currents.