Abstract
We present ac susceptibility measurements performed on (K, Ba)BiO3single crystals with different geometries: thick films, bars and hollow cylinders. We show that the hac 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 Hdc = 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 Tc cuprates.
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