Study of dependence upon the magnetic field and transport current of the magnetoresistive effect in YBCO-based bulk composites

The magnetoresistive properties of bulk YBCO + CuO and YBCO+BaPb0.75Sn0.25O3 composites for different orientations of external magnetic field H and macroscopic transport current j have been measured. These composites exhibit large magnetoresistance in weak magnetic fields (<100 Oe), which makes them promising candidates for practical application in magnetic field sensor devices. The difference between ρ(T) dependences, magnetoresistance curves R(H) and current–voltage characteristics measured for and is observed indicating the presence of the Lorentz-force-dependent dissipation in the composites. Angular dependences of magnetoresistance R(θ) (where ) of the composites in weak magnetic fields are found to be proportional to sin2θ. This fact suggests that the flux flow in the intergrain boundaries is responsible for the large magnetoresistive effect observed in the composites.

[1]  D. Gokhfeld,et al.  Magnetoresistive effect in bulk composites 1-2-3 YBCO + CuO and 1-2-3 YBCO + BaPb1?xSnxO3 and their application as magnetic field sensors at 77 K , 2004 .

[2]  Harris,et al.  Non-Ohmic dissipative regime in the superconducting transition of polycrystalline Y1Ba2Cu3Ox. , 1988, Physical review letters.

[3]  S. K. Hasanain,et al.  Orientational effects on the zero field cooled resistivity of a bismuth high Tc superconductor , 1991 .

[4]  John Bardeen,et al.  Theory of the Motion of Vortices in Superconductors , 1965 .

[5]  A. Kiliç,et al.  Influence of an external magnetic field on the current–voltage characteristics and transport critical current density , 1998 .

[6]  B. Albiss.  Thick films of superconducting YBCO as magnetic sensors , 2005 .

[7]  R. Decca,et al.  Anisotropic energy dissipation, flux flow and topological pinning in ceramic superconductors , 1992 .

[8]  K. Kitazawa,et al.  Lorentz-force-independent dissipation in high-temperature superconductors , 1994 .

[9]  Wright,et al.  Dissipation mechanism in a high-Tc granular superconductor: Applicability of a phase-slip model. , 1991, Physical review. B, Condensed matter.

[10]  Petersen,et al.  Phase-slip analysis of the non-Ohmic transition in granular YBa2Cu3O6.9. , 1993, Physical review. B, Condensed matter.

[11]  López,et al.  Anisotropic energy dissipation in high-Tc ceramic superconductors: Local-field effects. , 1991, Physical Review B (Condensed Matter).

[12]  M. Petrov,et al.  The mechanisms responsible for broadening of the resistive transition under magnetic field in the Josephson junction network realized in bulk YBCO + CuO composites , 2006 .

[13]  A. Barone,et al.  Physics and Applications of the Josephson Effect , 1982 .

[14]  Kim,et al.  Effects of microstructure on flux pinning in epitaxial YBa2Cu3Ox films. , 1991, Physical review. B, Condensed matter.

[15]  W. Kwok,et al.  Direct observation of dissipative flux motion and pinning by twin boundaries in YBa 2 Cu 3 O 7-δ single crystals , 1990 .

[16]  K. S. Aleksandrov,et al.  Critical currents in bulk composites , 1997 .

[17]  O. Gerashchenko,et al.  Study of longitudinal current problem in the low-field electrodynamics of HTS ceramics , 1997 .

[18]  R. Decca,et al.  Topological pinning and flux flow in ceramic superconductors , 1991 .