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Shalóm, D. E., and H. Pastoriza. "Experimental evidence for anisotropic response of a driven vortex lattice." Solid State Communications 126, no. 7 (2003): 379–383.
Abstract: We present kinetic inductance measurements in current driven Josephson junction arrays. Measurements performed with circular coils indicate that this technique is very sensitive to the vortex mobility. Results obtained with anisotropic detection coils provide experimental evidence for the anisotropic response of a driven vortex lattice. Anisotropic behavior is obtained when rising the temperature or the mean vortex velocity as indicated by the loss of the superconducting shielding capability, first in the direction of vortex motion and then in the perpendicular direction.
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Shalóm, D. E., S. Reparáz, and H. Pastoriza. "Finite Josephson junction arrays with open boundaries in magnetic field: Ground state energy and first critical field." The European Physical Journal B – Condensed Matter 40 (2004): 409–413.
Abstract: We have investigated the size dependence of the ground state energy as a function of the magnetic field in Josephson junction arrays with open boundaries. We present a simple rings model that reproduces with great confidence the size and field dependence of the energy of the system obtained by numerical simulation of the Hamiltonian. From these results we obtained the size dependence of the first penetration field, where the one-vortex state becomes favorable compared to the zero-vortex state.
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van der Beek, C. J., S. Demirdis, M. Konczykowski, Y. Fasano, N. R. Cejas Bolecek, H. Pastoriza, D. Colson, and F. Rullier-Albenque. "Vortex pinning : a probe for nanoscale disorder in iron-based superconductors." Physica B 407, no. 11 (2012): 1746–1749.
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Zarate, J. J., and H. Pastoriza. "Thermal response of Josephson junction arrays on silicon nitride membranes." Journal of Physics: Conference Series 150, no. 1 (2009): 012057–4.
Abstract: In order to study the vortex dynamics in Josephson junction arrays under temperature perturbations we have build Pb/Cu structures on top of Si3N4 membranes. Membranes with an area of 1 mm2 and with a thickness of 650 nm were fabricated by anisotropic etching of a silicon substrate previously covered with a low stress nitride film. By e-beam lithography and thermal evaporation we defined two similar SNS Josephson arrays one on top of the membrane and another on the bulk substrate. The heat source was provided illuminating the sample space with a conventional LED placed a few millimeters away from the substrate. Using the superconducting transition of both arrays the thermal response of the system has been characterized obtaining a cut-off frequency of 150 Hz and the power efficiency of our setup.
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Zarate, J. J., and H. Pastoriza. "Correction algorithm for the proximity effect in e-beam lithography." In Micro-Nanoelectronics, Technology and Applications, 2008. EAMTA 2008. Argentine School of, 38–42., 2008.
Abstract: e-beam lithography is a technique capable of fabricate sub-micrometer planar structures. The ultimate resolution in this technique is limited mainly by the proximity effect where the dose accumulated in one spacial point is affected by the irradiated dose in its neighborhood. The relevance of this effect in one particular pattern strongly depends on its geometry, the sensitivity of the resist and the physical characteristics of the substrate. In this work we present a numerical algorithm to calculate the nominal dose needed to be applied in each point of the geometry that results in an optimal net dose for an efficient pattern transfer.
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