✦ LIBER ✦

Nonlinear microwave absorption in Ba1−xKxBiO3

✍ Scribed by M. Warden; V.A. Ivanshin; P. Erhart

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 511 KB
Volume: 221
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(94)90661-0

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✦ Synopsis

Nonlinear, field-modulated, direct microwave absorption (FMMA) was observed in copper-free Ba~ ,K~BiO3 powder sampies. The high-field, low-temperature results were compared to previous measurements ofYBa CuO and BiSrCaCuO. The microwave determined critical field #oH* = 0.7 p_T and depinning current density J* z 1 × I() ~ ,X/m 2 were obtained from the "'Port is" model of flux pinning and depinning. These values were lower than the values obtained previously for YBaCuO and BiSr('aCu() as anticipated for a material with larger coherence length and comparable London penetration depth. ,\ previously unobserved asymmetry of the FMMA in the field scan direction was also noted.

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