Microwave magnetoabsorptions of (La, Gd, Ce)2CuOz superconductors

Abstract Microwave magnetoabsorption measurements were performed for a La 1.16 Gd 0.72 Ce 0.12 CuO z superconductor with T phase structure. An ESR line of Gd 3+ was observed, and its temperature variations were investigated. Nonresonant absorptions were observed below the superconducting critical temperature of 12 K, and the lower critical fields were determined.