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Type: Artigo de periódico
Title: Irreversible Magnetization Under Rotating Fields And Lock-in Effect On A Erba2cu3o7-δ Single Crystal With Columnar Defects
Author: Avila M.A.
Civale L.
Silhanek A.V.
Ribeiro R.A.
De Lima O.F.
Lanza H.
Abstract: We have measured the irreversible magnetization (Mi) of an ErBa2Cu3O7-δ single crystal with columnar defects (CD), using a technique based on sample rotation under a fixed magnetic field H. This method is valid for samples whose magnetization vector remains perpendicular to the sample surface over a wide angle range - which is the case for platelets and thin films - and presents several advantages over measurements of ML(H) loops at fixed angles. The resulting Mi(Θ) curves for several temperatures show a peak in the CD direction at high fields. At lower fields, a very well defined plateau indicative of the vortex lock-in to the CD develops. The H dependence of the lock-in angle ΦL follows the H-1 theoretical prediction, while the temperature dependence is in agreement with entropic smearing effects corresponding to long range vortex-defects interactions.
Rights: aberto
Identifier DOI: 
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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