Data di Pubblicazione:
2009
Abstract:
The temperature behavior of the first critical field B C1 of superconducting thin film samples can be
determined with high accuracy using an inductive and contactless method. Driving a sinusoidal
current in a single coil placed in front of the sample, a nonzero third harmonic voltage V 3 is induced
in it when Abrikosov vortices enter the sample. Conditions to be satisfied for the quantitative
evaluation of B C1 using this technique are detailed. As a validation test, different type II
superconductors Nb, NbN, MgB 2 , and Y 1 Ba 2 Cu 3 O 7-d under the form of thin films have been
measured. The comparison between experimental results, data presented in literature, and theoretical
predictions is presented and discussed.
determined with high accuracy using an inductive and contactless method. Driving a sinusoidal
current in a single coil placed in front of the sample, a nonzero third harmonic voltage V 3 is induced
in it when Abrikosov vortices enter the sample. Conditions to be satisfied for the quantitative
evaluation of B C1 using this technique are detailed. As a validation test, different type II
superconductors Nb, NbN, MgB 2 , and Y 1 Ba 2 Cu 3 O 7-d under the form of thin films have been
measured. The comparison between experimental results, data presented in literature, and theoretical
predictions is presented and discussed.
Tipologia CRIS:
01.01 Articolo in rivista
Elenco autori:
Andreone, Antonello; Lamura, Gianrico
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