Abstract
Nonlinear, field-modulated, direct microwave absorption (FMMA) was observed in copper-free Ba 1− x K x BiO 3 powder samples. The high-field, low-temperature results were compared to previous measurements of YBa CuO and BiSrCaCuO. The microwave wave determined critical field μ 0H ∗ = 0.7 μ T and depinning current density J ∗ c ≈ 1 × 10 7 A/m 2 were obtained from the “Portis” model of flux pinning and depinning. These values were lower than the values obtained previously for YBaCuO and BiSrCaCuO as anticipated for a material with larger coherence length and comparable London penetration depth. A previously unobserved asymmetry of the FMMA in the field scan direction was also noted.
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