Physics – Condensed Matter – Superconductivity
Scientific paper
2001-06-30
Phys. Rev. B 64, 144502 (2001)
Physics
Condensed Matter
Superconductivity
7 pages, 6 figures, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.64.144502
We have measured the irreversible magnetization M_i of an ErBa_2Cu_3O_7 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_L(H) loops at fixed angles. The resulting M_i(\Theta) 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 \phi_L follows the H^{-1} theoretical prediction, while the temperature dependence is in agreement with entropic smearing effects corresponding to short range vortex-defects interactions.
Avila Marcos A.
Civale Leonardo
de Lima O. F.
Lanza H.
Ribeiro Raquel A.
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