Grain Clusters Contribution To The Multilevel Granular Behavior In Melt-textured Yba 2cu 3o 7.d

Abstract

We report on the highly anisotropic behavior of the AC field dependence of the complex magnetic susceptibility of melt-textured grown samples of YBa 2Cu 3O 7-d. We show possible experimental evidences of the predicted grain clusters contribution to the granular behavior. We compare bulk results with those obtained from equivalent measurements performed on a-axis and c-axis YBa 2Cu 3O 7-d thin films. By applying the exponential critical state model (ECSM) we have obtained the average critical current density associated to grain clusters. © 2000 Elsevier Science B.V All rights reserved.341-348PART 1537538Clem, J.R., (1988) Physica C, 153-155, p. 50Müller, K.H., (1989) Physica C, 159, p. 717Dersch, H., Blatter, G., (1988) Phys. Rev. B, 38, p. 11391Araujo-Moreira, F.M., (1994) Physica C, 235-240, p. 3205(1996) J. Appl. Phys., 80, p. 3390Araujo-Moreira, F.M., (1999) Physica C, 311, pp. 98-106Chen, D.X., (1991) J. Appl. Phys., 70, p. 5463Araujo-Moreira, F.M., (1998) Appl. Phys. Lett., 73, p. 3456(1997) Phys. Rev. Lett., 78, p. 462