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artículo con referato
"Irreversible Magnetization under Rotating Fields and Lock-in Effect on ErBa2Cu3O7-δ Single Crystal with Columnar Defects"
M.A. Avila, L. Civale, A.V. Silhanek, R.A. Ribeiro, O.F. de Lima and H. Lanza
Phys. Rev. B 64(14) (2001) 144502/1-8
We have measured the irreversible magnetization 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 M(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 ψL follows the H-1 theoretical prediction, while the temperature dependence is in agreement with entropic smearing effects corresponding to short range vortex-defects interactions.
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