Enhanced flux pinning in Bi-2212 single crystals by planar defects introduced via Ti-substitution

Abstract Ti-doped Bi-2212 single crystals were grown by the travelling solvent floating zone technique. Concentrations of about 1 at% and 2 at% (with respect to Cu) were shown to be incorporated in the structure which leads to lowering of T c to about 73 K from 85 K. High resolution microscopy revealed high densities of planar defects parallel to the a , c -planes. The flux pinning properties at elevated temperatures are significantly improved with respect to undoped single crystals.

[1]  G. Rao,et al.  Structure and superconductivity studies on Fe and Co doped Bi-2212 , 1993 .

[2]  M. Pouchard,et al.  Strong shift of the irreversibility line in bismuth and thallium based 2212 HTSC single crystals irradiated by 6.0 GeV Pb ions , 1992 .

[3]  T. Lundström,et al.  Substitution of vanadium and chromium for copper in Bi2Sr2CaCu2O8 , 1992 .

[4]  Campbell,et al.  Quantum tunneling of flux lines in single-crystal Bi2Sr2CaCu2O8 with columnar defects. , 1993, Physical review. B, Condensed matter.

[5]  Vinokur,et al.  Vortex line pinning and Bose-glass dynamics in heavy-ion irradiated Bi2Sr2CaCu2O8+ delta single crystals. , 1995, Physical review letters.

[6]  Bach,et al.  Superconductivity in Bi2Sr2CaCu2O8+ delta single crystals doped with Fe, Ni, and Zn. , 1994, Physical review. B, Condensed matter.

[7]  Weber,et al.  Analysis of pinning effects in YBa2Cu3O7- delta single crystals after fast neutron irradiation. , 1995, Physical review. B, Condensed matter.

[8]  E. Zeldov,et al.  Vortex-lattice phase transitions in Bi2Sr2CaCu2 O8 crystals with different oxygen stoichiometry. , 1996, Physical review letters.

[9]  V. Hardy,et al.  Unusual field dependence of the reversible magnetization in heavy ions irradiated thallium-based single crystals , 1995 .

[10]  P. Kes,et al.  Growth of Bi2Sr2CaCu2O8+x single crystals at different oxygen ambient pressures , 1994 .

[11]  P. Kes,et al.  Anisotropic oxygen diffusion in Bi2Sr2CaCu2O8+x single crystals , 1994 .

[12]  Greene,et al.  Crystal substructure and physical properties of the superconducting phase Bi4(Sr,Cr)6Cu4O16+x. , 1988, Physical review. B, Condensed matter.

[13]  Yacoby,et al.  Effect of 5.3-GeV Pb-ion irradiation on irreversible magnetization in Y-Ba-Cu-O crystals. , 1991, Physical review. B, Condensed matter.

[14]  A. Koshelev,et al.  The role of surface effects in magnetization of high-Tc superconductors , 1990 .

[15]  H. Maeda,et al.  Anisotropy of critical current density in textured Bi2Sr2Ca1Cu2Ox tapes , 1991 .

[16]  Sun,et al.  Vortex confinement by columnar defects in YBa2Cu3O7 crystals: Enhanced pinning at high fields and temperatures. , 1991, Physical review letters.