Josephson Junction Arrays

This work is done in collaboration with the experimental group of Prof. Martinoli at our institute with two previous graduate students:

M. Mombelli (mdmombelli@bluewin.ch)

Massimiliano Capezzali, Queen's University, Kingston, Canada

and the following external collaborations:

Subodh Shenoy, ICTP, Trieste (shenoy@ictp.trieste.it)

Dierk Bormann, Universität Augsburg, Germany, (bormann@physik.uni-augsburg.de)

We study the electromagnetic response of two-dimensional Josephson junction arrays (JJA), which is measured at our Institute. The following problems are currently under investigation:

Calculation of the frequency dependent vortex mobility by using Mori's technique for calculating dynamic correlation functions with the particular aim of elucidating the dynamic scaling and the critical slowing down near the Kosterlitz-Thouless transition

Calculation of the spin wave and the vortex contribution to the dynamic impedance of diluted arrays (with missing bonds or missing sites).

Recent Publications:

Dynamics of vortices in disordered Josephson junction arrays

Physica B

Dynamic measurement of percolative critical exponents in disordered Josephson junction arrays
A.L.Eichenberger, J.Affolter, M.Willemin, M.Mombelli, H.Beck, P.Martinoli, S.E.Korshunov; Phys Rev Lett 77, 3905 (1996)

Regime interpretation of anomalous vortex dynamics in 2D superconductors

Phys Rev Lett

Electrodynamic response of disordered Josephson-junction arrays
M. Mombelli, H. Beck; Phys Rev B, June 1998

Diploma Thesis

Bruit du flux magnetique dans un JJA