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- W1975284763 abstract "Magnetic relaxation and flux pinning behaviors have been investigated on the c-axis oriented [YBa2Cu3O7 (24 Angstrom)/PrBa2Cu3O7 (24 Angstrom)](12) multilayers in the perpendicular magnetic fields (H parallel to c-axis) up to 2 T. The critical current density, J(c), value is of the order of 10(6) A/cm(2) in the investigated temperature range and at magnetic field H approximate to 0. The proximate logarithmic dependence of magnetization on time is observed in this multilayers. The magnetic relaxation rate Q = dM/dln t decreases monotonically with increasing temperature. The normalized magnetic relaxation rate S shows a maximum value in S-T curves at low magnetic fields. The behaviors of Q and S are found to be strongly dependent on the magnetic fields. A scaling form of vortex activation energy, U-eff(J, T) = U(i)G(T)F(J(i)/J) was used to analyze the flux pinning behavior at the given magnetic field. Here U-i and J(i) are scaling constants of activation energy and current density, respectively, and G(T) is empirically chosen as G(T) = (1-(T/T-r)(2))(3/2) With T-r being the irreversibility temperature. The current density dependence of U-eff is in agreement with the prediction of collective-pinning theory. The possible pinning mechanisms are proposed. (C) 1997 Elsevier Science B.V." @default.
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- W1975284763 date "1997-12-01" @default.
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- W1975284763 title "Crystal Structure and Curie Temperature of Sm2Fe17—yGayCx" @default.
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- W1975284763 doi "https://doi.org/10.1002/1521-396x(199712)164:2<649::aid-pssa649>3.0.co;2-#" @default.
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