Observation of reduced activation energy and the possible existence of decoupled pancake vortices in superconductor/ferromagnet bilayers
Data(s) |
28/07/2010
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Resumo |
Investigations of different superconducting (S)/ferromagnetic (F) heterostructures grown by pulsed laser deposition reveal that the activation energy (U) for the vortex motion in a high T-c superconductor is reduced remarkably by the presence of F layers. The U exhibits a logarithmic dependence on the applied magnetic field in the S/F bilayers suggesting the existence of decoupled two-dimensional (2D) pancake vortices. This result is discussed in terms of the reduction in the effective S layer thickness and the weakening of the S coherence length due to the presence of F layers. In addition, the U and the superconducting T-c in YBa2Cu3O7-delta/La0.5Sr0.5CoO3 bilayers are observed to be much lower than in the YBa2Cu3O7-delta/La0.7Sr0.3MnO3 ones. This in turn suggests that the degree of spin polarization of the F layer might not play a crucial role for the suppression of superconductivity due to a spin polarized induced pair-breaking effect in S/F bilayers. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/31036/1/enegy.pdf Samal, D and Sow, Chanchal and Kumar, Anil PS (2010) Observation of reduced activation energy and the possible existence of decoupled pancake vortices in superconductor/ferromagnet bilayers. In: Journal of Physics: Condensed Matter, 22 (29). |
Publicador |
Institute of Physics |
Relação |
http://iopscience.iop.org/0953-8984/22/29/295701 http://eprints.iisc.ernet.in/31036/ |
Palavras-Chave | #Physics |
Tipo |
Journal Article PeerReviewed |