Angular Dependence of the Activation Energy in YBCO/PBCO Multilayers |
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| Authors: | A Casaca G Bonfait V Galindo JP Sénateur D Feinberg |
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| Affiliation: | (1) Dpto. de Química, ITN, 2686 Sacavém Codex, Portugal;(2) Centro de Física, ISEL, 1900 Lisboa, Portugal;(3) Dpto. de Física, FCT/UNL, 2825 Monte de Caparica, Portugal;(4) LMGP- ENSPG, BP 46, 38042 Saint Martin d'Hères Cedex, France;(5) LEPES/CNRS, BP 166, 38042 Grenoble Cedex 9, France |
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| 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, ) scales with a reduced field B
red
=B(sin
2
+cos
2
/
2
)
1/2
, with an angle dependent anisotropy parameter . A crossover from U
0
 log B
red
, at low B
red
, to U
0
(B
red
)
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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| Keywords: | |
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