Nonlinear ac response of the vortex system in the cubic (K, Ba)BiO 3 superconductor

A. Conde-Gallardo, I. Joumard, J. Marcus and T. Klein ()

The European Physical Journal B: Condensed Matter and Complex Systems, 1999, vol. 11, issue 2, 255-259

Abstract: We present ac susceptibility measurements performed on (K, Ba)BiO 3 single crystals with different geometries: thick films, bars and hollow cylinders. We show that the h ac dependence of the real (χ′) and imaginary (χ′) parts of the ac susceptibility is in very good agreement with Brandt’s numerical calculations (Phys. Rev. B 58, 6523 (1998)) in the modified Bean critical state. Creep effects (at H dc =0.3T) are investigated by studying the frequency dependence of the current density deduced from the temperature scans of the ac susceptibility over a large frequency range (0.02 Hz > ω > 2000 HZ). The relaxation rate S=dln(J)/dln(ω) ∼ 4% is temperature independent and very similar to the one usually obtained in high T c cuprates. Copyright Società Italiana di Fisica, Springer-Verlag 1999

Keywords: PACS. 74.60.Ge Flux pinning; flux creep; and flux-line lattice dynamics; 74.60.Ec Mixed state; critical fields; and surface sheath; 74.25.Nf Response to electromagnetic fields (nuclear magnetic resonance; surface impedance; etc.) (search for similar items in EconPapers)
Date: 1999
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DOI: 10.1007/s100510050936

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