Artículos de revistas
Exponential Critical State Model Applied To Ac Susceptibility Data For The Superconductor Yba2cu3o7-δ
Registro en:
Journal Of Applied Physics. , v. 80, n. 6, p. 3390 - 3395, 1996.
218979
2-s2.0-0030244052
Autor
Araujo-Moreira F.M.
Ortiz W.A.
De Lima O.F.
Institución
Resumen
We derive new expressions for the average magnetization loops, M(H), based on the exponential critical state model. The components χ′ and χ″ of the complex susceptibility are calculated and an algorithm to fit ac susceptibility data is discussed. This algorithm is employed to study the intergranular response χ′(Hm) and χ″(Hm) measured for two samples of YBa2Cu3O7-δ as a function of the ac field amplitude Hm. One sample is a porous sintered cylinder and the other is a very dense melt-textured bar. In both cases good fits of the calculated components χ′ and χ″ are obtained using an algorithm that involves two free parameters, the full penetration field. Hp, and the sample quality factor, p. An interesting result for the melt-textured sample is the observation of a step in χ′(Hm) curves at very low Hm. possibly associated with grain clustering. © 1996 American Institute of Physics. 80 6 3390 3395 Goldfarb, R.B., Lelenthal, M., Thomson, C.A., (1991) Susceptibility of Superconductors and Others Spin Systems, p. 204. , edited by R. A. Hein, T. L. Francavilla, and D. H. Lieberger Plenum Press, New York Couach, M., Khoder, A.F., Monnier, F., (1989) Cryogenics, 25, p. 695 Goldfarb, R.B., Clark, A.F., (1988) Cryogenics, 27, p. 475 Chen, D.X., Goldfarb, R.B., (1988) J. Appl. Phys., 63, p. 980 Larbalestier, D.C., Babcock, S.E., Cai, X., Daeumling, M., Hampshire, D.P., Kelly, T.F., Lavanier, L.A., Seuntjens, J., (1988) Physica C, 153-155, p. 1580 Worthington, T.K., Gallagher, W.J., Dingerm, T.R., (1987) Phys. Rev. Lett., 59, p. 1160 Tanaka, S., Itozaki, H., (1988) J. Appl. Phys., 27, pp. L622 Dersch, H., Blatter, G., (1988) Phys. Rev. B, 38, p. 11391 Moreira, F.M.A., Ortiz, W.A., De Lima, O.F., (1994) Physica C, 245, p. 3205 Bean, C.P., (1962) Phys. Rev. Lett., 8, p. 250 Bean, C.P., (1964) Rev. Mod. Phys., 36, p. 31 London, H., (1963) Phys. Lett., 6, p. 162 Kim, Y.B., Hempstead, C.F., Strnad, A.R., (1963) Phys. Rev., 129, p. 528 Fietz, W.A., Beasley, M.R., Silcox, J., Webb, W.W., (1964) Phys. Rev., 136, pp. A335 Xu, M., Shi, D., Fox, R.F., (1990) Phys. Rev. B, 42, p. 10773 Chen, D.X., Goldfarb, R.B., (1989) J. Appl. Phys., 66, p. 2489 Chen, D.X., Sanchez, A., Muñoz, J.S., (1990) J. Appl. Phy., 67, p. 3430 Chen, J.L., Yang, T.J., (1994) Physica C, 224, p. 345 Chen, D.X., Sanchez, A., (1991) J. Appl. Phys., 70, p. 5463 Ishida, T., Goldfarb, R.B., (1990) Phys. Rev. B, 41, p. 8937 Sanchez, A., (1994) Physica C, 225, p. 136 Shi, D., Chen, J.G., Salem-Sugui Jr., S., Goretta, K.C., (1991) Physica C, 185-189, p. 2329 Sanchez, A., Chen, D.X., (1991) Susceptibility of Superconductors and Others Spin Systems, p. 251. , edited by R. A. Hein, T. L. Francavilla, and D. H. Lieberger Plenum, New York Gelfuso, V.C., Ortiz, W.A., unpublished