ISSN:
1573-7357
Schlagwort(e):
74.80.Dm
;
74.60.Ge
;
74.50.+r
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract YBa2Cu3O7−δ/(Y1−xPrx)Ba2Cu3O7−δ multilayers have been used to probe coupling through (Y1−x:Prx)Ba2Cu3O7−δ alloys. We observe that the coupling between ultrathin YBa2Cu3O7−δ layers, 12 or 24 Å thick, survives through several hundred Å of (Y1−xPrx)Ba2Cu3O7−δ with x=0.4 and 0.55. Tc versus the thickness of the spacer-alloy, and activation energies for flux motion, with fields parallel and perpendicular to the c-axis, have been used to probe this long range coupling. All these experiments point to an unusually large coupling length for these two alloy compositions. In the x=0.55 case this result is particularly surprising since the alloy material display a semiconducting behaviour for this composition. Tc measurements, activation energies, and a study of the vortex dynamics in these coupled multilayers is presented along with new results obtained on a series of multilayers built with a more insulating alloy, x=0.7.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00753883
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