Showing papers by "Saburo Takahashi published in 1994"
TL;DR: In this paper, the effect of low frequency plasma observed in cuprate oxides on the ac Josephson effect was investigated, and the new equation for the phase difference across the junctions barrier was derived, which included the interaction between the Josephson current and the bulk plasma.
Abstract: The effect of the low frequency plasma observed in cuprate oxides on the ac Josephson effect is investigated. The new equation for the phase difference across the junctions barrier is derived, which includes the interaction between the Josephson current and the bulk plasma. The ac Josephson current excites the bulk plasma.
1 citations
TL;DR: In this paper, the nature of the low frequency plasma in cuprate superconductors and the electromagnetic phenomena related to the plasma excitation are theoretically studied, and it is predicted that the low-frequency plasma is excited by the ac Josephson effect.
Abstract: The nature of the low frequency plasma in cuprate superconductors and the electromagnetic phenomena related to the plasma excitation are theoretically studied. The interaction of electromagnetic wave with the transverse part of the low frequency plasma causes a peculiar frequency and magnetic field dependence of the reflectivity and transmissivity for a film of cuprate superconductor. It is predicted that the low frequency plasma is excited by the ac Josephson effect.
1 citations
29 Jun 1994
TL;DR: In this article, the authors theoretically study the vortex states in superconducting multilayers whose components are superconductors with nearly same transition temperatures but very different upper critical fields.
Abstract: The authors theoretically study the vortex states in superconducting multilayers whose components are superconductors with nearly same transition temperatures but very different upper critical fields. They solve the nonlinear ginzburg-Landau equations numerically for the vortex lattice state of the multilayers. Two kinds of different vortex lattice states appear between the lower and upper critical fields. From the free energy calculations, the authors determine the phase boundary between the two vortex lattice states and map a phase diagram in the H-T plane. The peak effect of the critical current observed in Nb/NbZr multilayers is discussed in connection with the vortex states in these multilayers.
1 citations