Possible entanglement of the vortices in dyba2cu3O7 (y1-xprx)ba2cu3O7 coupled heterostructure
1994 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, Vol. 235, 2599-2600 p.Article in journal (Refereed) Published
Thermally activated flux motion is studied in proximity coupled multilayers, containing a number N of 24 Angstrom thick DyBa2Cu3O7 layers separated by 96 Angstrom (or more) of(Y1-xPrx)Ba2Cu3O7 alloy (x=0.4, x=0.55). In contrast to ultra-thin decoupled layers, for which we find that the activation energy for flux motion U approximate to=logB (H//c), coupled samples show a cross-over to a power law behaviour U approximate to B–0.5 at magnetic field H*. This characteristic field depends on the anisotropy and decreases as N increases, a behaviour which can be understood in terms of the entanglement of the vortices, resulting in a relative increase of U due to the flux line crossing energy.
Place, publisher, year, edition, pages
1994. Vol. 235, 2599-2600 p.
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:kth:diva-50000DOI: 10.1016/0921-4534(94)92520-8ISI: A1994QC69600225OAI: oai:DiVA.org:kth-50000DiVA: diva2:460862
QC 20111206. International Conference on Materials and Mechanisms of Superconductivity - High Temperature Superconductors IV (M2S-HTSC IV), GRENOBLE, FRANCE, JUL 05-09, 19942011-12-012011-12-012011-12-06Bibliographically approved