Bi-Pb-Sr-Ca-Cu-O系多結晶薄膜の弱磁場中での磁気感応性

概要

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Bi-Pb-Sr-Ca-Cu-O superconductive films with various T_c(65-105 K) and various J_c(0-155 A/cm^2 at 77 K) were obtained by annealing thin films prepared by rf-magnetron sputtering at 823°- 850℃ for 110 h. A high T_c and low J_c film showed a high magnetic sensibility. Especially, the magnetic sensibility of the film annealed at 844℃ was 1.87mV/Gauss at 77.3 K. However, the magnetic sensibility of the film with higher J_c (155 A/cm^2) which was obtained by annealing at 850℃, was low. The magnetic sensibility was high for the films with plate-like crystals partially parallel and partially perpendicularly oriented to the MgO substrate (mixed morphology). On the other hand, films composed of almost oriented plate-like crystals showed low magnetic sensibilities. It is considered that the invaded flux in the film with mixed morphology was very motive because of the weak-link grain boundaries.
社団法人日本セラミックス協会の論文
1991-03-01