The Vortex Decoupling Transition In Bi2212 Crystals With Columnar Defects

Two Bi2Sr2CaCu2O8+δ single crystals were characterized, before and after irradiation with 200 MeV Ag ions under fluence of 5 × 1010 ions/cm2. Columnar defects were produced along the c-axis direction in one crystal, and in a direction tilted by an angle of 30° with respect to the c-axis for the other crystal. The 3D-2D vortex decoupling lines were significantly shifted to higher temperatures, after irradiation of the crystals, for magnetic fields smaller than the matching value BΦ ≈ 1 T. For B > 3 T the decoupling lines for the irradiated crystals tend smoothly to the same behavior observed in the original crystals, up to the maximum probed field of 5 T. Interestingly the vortex pinning by columnar defects was found to be almost independent of the applied magnetic field direction, as revealed by the width of magnetization loops. © 2005 Elsevier B.V. All rights reserved.437-438SPEC. ISS.6164Civale, L., Marwick, A.D., Worthington, T.K., Kirk, M.A., Thompson, J.R., Krusin-Elbaum, L., Sun, Y., Holtzberg, F., (1991) Phys. Rev. Lett., 67, p. 648Konczykowski, M., Rullier-Albenque, F., Yacoby, E.R., Shaulov, A., Yeshurun, Y., Lejay, P., (1991) Phys. Rev. B, 44, p. 7167Blatter, G., Feigel'man, M.V., Geshkenbein, V.B., Larkin, A.I., Vinokur, V.M., (1994) Rev. Mod. Phys., 66, p. 1125Avila, M.A., Civale, L., Silhanek, A.V., Ribeiro, R.A., de Lima, O.F., Lanza, H., (2001) Phys. Rev. B, 64, p. 144502Nelson, D.R., Vinokur, V.M., (1992) Phys. Rev. Lett., 68, p. 2398Krusin-Elbaum, L., Civale, L., Blatter, G., Marwick, A.D., Holtzberg, F., Field, C., (1994) Phys. Rev. Lett., 72, p. 1914van der Beek, C.J., Konczykowski, M., Vinokur, V.M., Crabtree, G.W., (1995) Phys. Rev. B, 51, p. 15492Koshelev, A.E., Le Doussal, P., Vinokur, V.M., (1996) Phys. Rev. B, 53, p. 8855Glazman, L.I., Koshelev, A.E., (1991) Phys. Rev. B, 43, p. 2835Banerjee, S.S., Soibel, A., Myasoedov, Y., Rappaport, M., Zeldov, E., Menghini, M., Fasano, Y., Tamegai, T., (2003) Phys. Rev. Lett., 90, p. 087004Banerjee, S.S., Goldberg, S., Soibel, A., Myasoedov, Y., Rappaport, M., Zeldov, E., de la Cruz, F., Vinokur, V.M., (2004) Phys. Rev. Lett., 93, p. 097002de Lima, O.F., Awana, V.P.S., Ribeiro, R.A., Avila, M.A., (2000) Europhys. Lett., 51, p. 174de Almeida, R.L., de Lima, O.F., (2004) Physica C, 408-410, p. 512Thompson, J.R., Sun, Y.R., Kerchner, H.R., Christen, D.K., Sales, B.C., Chakoumakos, B.C., Marwick, A.D., Civale, L., (1992) Appl. Phys. Lett., 60, p. 230