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Microwave nonlinearities of an isolated long YBa2Cu3O7-bicrystal grain boundary Sheng-Chiang Lee,* Su-Young Lee, and Steven M. Anlage

Summary: Microwave nonlinearities of an isolated long YBa2Cu3O7- bicrystal grain boundary
Sheng-Chiang Lee,* Su-Young Lee, and Steven M. Anlage
Center for Superconductivity Research, Physics Department, University of Maryland, College Park, Maryland 20742-4111, USA
Received 6 August 2004; revised manuscript received 28 February 2005; published 18 July 2005
We measure the local harmonic generation from an YBa2Cu3O7- YBCO bicrystal grain boundary to
examine the local Josephson nonlinearities without the influence of edges. Spatially resolved images of second
and third harmonic signals generated by the grain boundary are shown. The harmonic generation and the vortex
dynamics along the grain boundary are modeled with the extended resistively shunted Josephson array model,
which shows reasonable quantitative agreement with the experimental data. The model also gives qualitative
insight into the vortex dynamics induced in the junction by the probing current distribution. A characteristic
nonlinearity scaling current density JNL 1.5 105
for the Josephson nonlinearity is also extracted.
DOI: 10.1103/PhysRevB.72.024527 PACS number s : 74.50. r, 74.25.Nf, 74.81.Fa, 74.78.Bz
The nonlinear behavior of high-Tc superconductors has
been of great concern because it can potentially reveal the
underlying physics of these materials. While the microscopic
origins of nonlinear response still remain uncertain, all su-
perconductors have an intrinsic time-reversal symmetric


Source: Anlage, Steven - Center for Superconductivity Research & Department of Physics, University of Maryland at College Park


Collections: Materials Science