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VOLUME 46 (1987) | ISSUE 3 | PAGE 111
Giant absorption of an rf electromagnetic field in conducting ceramics
A giant absorption of power from an rf field (v~ 1 GHz) has been observed in La2Cu04 and in systems with a metallic conductivity, La2 _x Srx Cu04 _ y and YBa2Cu307 + δ. The observed effects are interpreted as ferroelectric anomalies at finite frequencies, caused by the low-frequency lattice dynamics. A phenomenological model is offered to describe the coexistence of ferroelectric anomalies and a metallic conductivity.