Treffer: Vortex interaction energy in planar josephson junction arrays at high density
Dipartimento di Fisica, Università di Camerino, Camerino (MC) 62100, Italy
INFM-CNR SuperMat and Università del Sannio, Dipartimento Scienze Biologiche ed Ambientali, Benevento 82100, Italy
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We study the vortex-vortex and vortex-antivortex interaction in arrays of Josephson junction particularly addressing the effect of mutual induction in the intermediate screening ranges (βa = 0.5). The modifications of the barrier energy for the displacement of a vortex in presence of a second vortex (antivortex), or more vortices (antivortices), are derived in an adiabatic approach. To this end, we have developed a fast explicit algorithm, which permits to retrieve the phases and the magnetization of the array in a reasonable time and with little memory occupation for relatively large arrays [e.g. o(100 x 100)]. This new model is able to catch the essential characters of the more complex fully mutual coupling model. We provide also some indications on the relation between energy barriers and the observation of vortex quantum tunneling phenomena in Josephson arrays and related systems as high-Tc films.