Critical current density of screen printed YBa2Cu3O7−x sintered thick film

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Abstract
This paper investigates the critical current density (Jc) of sintered YBa2Cu3O7−x thick film prepared by the screen printing method. Two thick films with different crystal morphologies, which exhibit a Jc of 70 and 700 A/cm2 at 77 K, are compared in terms of crystal orientation, the pinning force in the grains, and the pinning force at the grain boundaries. Both these thick films exhibit random crystal orientations, and have many weak links. An M-H examination suggests that these two thick films have similar pinning forces in the grains, and no anisotropy of the pinning force. The larger Jc-H hysteresis exhibited in the film with the larger Jc implies an improvement in the pinning force at the grain boundaries. This improvement may cause the larger Jc.