MAGNETIC-FIELD-INDUCED CHARGING EFFECTS IN JOSEPHSON-JUNCTION ARRAYS

A magnetic field induced electric polarization (analog of magnetoelect ric effect) and the corresponding change of an effective junction capa citance are considered within a 3D model of disordered Josephson junct ion arrays. At some threshold field (near the Josephson network critic al field), the effective junction charge and the related capacitance a re shown to reach a maximum and to change a sign, respectively. A poss ibility to observe the predicted effects in artificially prepared arra ys of superconducting grains is discussed.