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Lecture Alexey Kalinov


15 April 2004 FWN-Building 5116.0107, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Alexey Kalinov
Affiliation: All-Russian Electrical Engineering Institute, Moscow, Russia
Title: Strong suppression of relaxation in YBaCuO superconductors
Date: Thu Apr 15, 2004
Start: 10.00
Location: FWN-Building 5116.0107
Host: Thom Palstra
Telephone: +31 50 363 4419


The effect of the transverse AC magnetic field on relaxation process in YBa2Cu3x melt-textured superconductor was studied. We have observed the giant (up to 50 times) decrease of the relaxation rate after the action of the transverse AC magnetic field. This effect exists both in the relaxation of the 'static' magnetization and in the local value of the trapped magnetic induction. Besides, after the action of the AC magnetic field, the distribution of the magnetic induction on the sample surface turns out to be frozen with the same critical current density. The observed effect can be a result of the increase of the collective pinning potential due to the increase of the vortex-bundles dimension in the ab-plane. The increase of the vortex length accompanied by partial locking of the vortex segments in the ab-planes could also be a reason of this phenomenon.
Last modified:22 October 2012 2.30 p.m.