185 research outputs found
On Field Induced Diaelastic Effect in a Small Josephson Contact
An analog of the diaelastic effect is predicted to occur in a small Josephson
contact with Josephson vortices manifesting itself as magnetic field induced
softening of the contact shear modulus C(T,H). In addition to Fraunhofer type
field oscillations, C(T,H) is found to exhibit pronounced flux driven
temperature oscillations near T_C
Dipole-dipole interaction of Josephson diamagnetic moments
The role of dipole-dipole interaction between Josephson diamagnetic moments
is considered within a model system of two clusters (each cluster contains
three weakly connected superconducting grains). The sign of the resulting
critical current is shown to depend on the orientation between clusters,
allowing for both 0 and type junctions behavior. The possibility of the
experimental verification of the model predictions is discussed
Novel magnetoinductance effects in Josephson Junction Arrays: A single-plaquette approximation
Using a single-plaquette approximation, novel magnetoinductance effects in
Josephson junction arrays (JJAs) are predicted, including the appearance of
steps in the temperature behavior of magnetic susceptibility. The number of
steps (as well as their size) is controlled by the kinetic inductance of the
plaquette whose field dependence is governed by the Abrikosov vortices
penetrating superconducting regions of the array. The experimental conditions
under which the predicted effects should manifest themselves in artificially
prepared JJAs are discussed.Comment: Accepted for publication in PL
On Electrostriction of a Granular Superconductor
Zero-temperature field-induced polarization, supercurrent density, and the
related electrostriction (ES) of a granular superconductor are calculated
within a model of 3D Josephson junction arrays. Both the "bulk-modulus-driven
ES" (the change of the sample's volume in the free energy upon the applied
stress) and the "change-of-phase ES" (due to the stress dependence of the
weak-links-induced polarization) are considered. In contrast to
magnetostriction of a granular superconductor, its electroelastic behavior is
predicted to be dominated by the former contribution for all applied fields.Comment: REVTEX (epsf style), 3 EPS figure
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