Abstract
The activation energy in several (YBCO) m /(PBCO) n superconducting multilayers was deduced from resistivity measurements in magnetic fields up to 16 T, as a function of the angle between the magnetic field and the ab planes. The activation energy U 0 (B,θ) scales with a reduced field B red =B(sin 2 θ+cos 2 θ/Γ 2 ) 1/2 , with an angle dependent anisotropy parameter Γ. A crossover from U 0 ∝log B red , at low B red , to U 0 ∝(B red ) α at high B red , is also observed. The implications of these results on vortex dynamics and on the coupling between the superconducting layers will be discussed.
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Casaca, A., Bonfait, G., Galindo, V. et al. Angular Dependence of the Activation Energy in YBCO/PBCO Multilayers. Journal of Low Temperature Physics 117, 1459–1463 (1999). https://doi.org/10.1023/A:1022510204315
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DOI: https://doi.org/10.1023/A:1022510204315