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Type: Artigo de periódico
Title: Low-field Magnetic Relaxation Study Of A Yba2cu3ox Single Crystal With H ∥ A-b Planes
Author: Salem-Sugui Jr. S.
Alvarenga A.D.
Schilling O.F.
Sengupta S.
Abstract: We have measured magnetic relaxation M versus time in a twin-free single crystal of YBa2Cu3Ox for magnetic fields applied parallel to a-b planes. Magnetic relaxation is studied as a function of temperature (T) for a fixed field (H) and at a fixed T as a function of H. Long-time M versus t curves were mainly obtained for the partial field penetrating regime. All log M versus log t curves obtained in the partial-field regime present a kink at time t* separating two distinct regions. The kink gradually disappears as the applied field fully penetrates the sample. The value of t* is constant for all field values. Similar but more accentuated differences are observed when the effective activation energy U extracted from the data is plotted against M(t). A linear behaviour of U with M is observed in the full field penetrated regime. We estimate that the Bean penetration depth increases exponentially with H in the partial-field regime. We also determined the range of temperatures for which surface barriers are important at the initial stage of relaxation.
Rights: fechado
Identifier DOI: 10.1088/0953-2048/10/5/004
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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