Anisotropic transport properties of BSCCO single crystalsand Ag-clad tapes in high magnetic fields

The resistive transition (T,H) in granular high-T c superconductors is described by a combination of the effective-medium approximation for anisotropic mixtures with the percolation theory. We found a single parameter accounting for both the structural anisotropy as well as for the intrinsic resistivity anisotropy of a single grain. We obtained a direct ͑no fitting parameters͒ estimate of the superconducting volume fraction f as a function of temperature, as well as of the percolation threshold f p and of the zero-resisitivity threshold f 0 . The model describes successfully the experimental (T,H) dependence at different relative directions of the c axis, the current j and the magnetic field H in Bi 2 Sr 2 CaCu 2 O 8Ϫx ceramics. We provided estimates for the value of the Josephson critical current between grains. The latter proves to be strongly suppressed even by weak magnetic fields HϽ750 Oe. This results in the appearance of the field-induced excess resistivity ⌬ that obeys the dependence 1/⌬Ӎ1ϩH /H, where H is the characteristic field trapped by a single Josephson contact.

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Anisotropic transport properties of BSCCO single crystalsand Ag-clad tapes in high magnetic fields

Cited by 3 publications

References 16 publications

Crystal orientation in Bi-based superconducting glass-ceramics prepared in high magnetic field

Crystal orientation in Bi-based superconducting glass-ceramics prepared in high magnetic field

Metastability line in the phase diagram of vortices inBi2Sr2CaCu
Sas
¹
,
Portier
²
,
Vad
³

et al. 2000
Phys. Rev. B
31
2
30
0
View full text Add to dashboard Cite

Resistive transition anisotropy in superconducting granular ceramics: Interplay of effective medium approximation and percolation

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Anisotropic transport properties of BSCCO single crystalsand Ag-clad tapes in high magnetic fields

Cited by 3 publications

References 16 publications

Crystal orientation in Bi-based superconducting glass-ceramics prepared in high magnetic field

Crystal orientation in Bi-based superconducting glass-ceramics prepared in high magnetic field

Metastability line in the phase diagram of vortices inBi2Sr2CaCuSas1, Portier2, Vad3 et al. 2000Phys. Rev. B312300View full textAdd to dashboardCite

Resistive transition anisotropy in superconducting granular ceramics: Interplay of effective medium approximation and percolation

Contact Info

Product

Resources

About

Metastability line in the phase diagram of vortices inBi2Sr2CaCu
Sas
¹
,
Portier
²
,
Vad
³

et al. 2000
Phys. Rev. B
31
2
30
0
View full text Add to dashboard Cite