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Communication Dans Un Congrès Année : 1993

Very low field flux penetration in halogenated cuprates

C. Lebeau
  • Fonction : Auteur
J. Rosenblatt
  • Fonction : Auteur
Jean-Philippe Burin
Youssef Fouad
  • Fonction : Auteur
  • PersonId : 937768
A. Raboutou
  • Fonction : Auteur
P. Peyral
  • Fonction : Auteur
M. Mokhtari
  • Fonction : Auteur
C. Perrin
  • Fonction : Auteur

Résumé

The low-frequency non linear magnetic susceptibility chi(H,T) of YBa2Cu3O7-deltaFx ceramics (delta = 0 and 0.3) is measured in the range 0 <= x <= 0.2, 15K <= T < Tc, with Tc the coherence critical temperature and ac field amplitude 10(-8) T < µ0H0 < 10(-2) T. We find that the real part chi'(H0,T) = f[H1(T,x)/H0] is a universal scaling function for all samples with H1(T,x) = H1(0,x)epsilon(phi) the experimentally determined first flux penetration field, epsilon = 1-T/Tc and phi = 2.7+/-0.2. We describe a model where the order parameter is localized in randomly coupled regions whose critical behaviour depends on couplings above a temperature-dependent threshold. The observed dependence H1(T) results from screening currents circulating in percolation fractal clusters.
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Dates et versions

hal-00502137 , version 1 (13-07-2010)

Identifiants

  • HAL Id : hal-00502137 , version 1

Citer

C. Lebeau, J. Rosenblatt, Jean-Philippe Burin, Youssef Fouad, A. Raboutou, et al.. Very low field flux penetration in halogenated cuprates. THIRD EURO-CERAMICS, Sep 1993, Madrid, Spain. pp.577. ⟨hal-00502137⟩
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