The non-resonant microwave absorption (NRMA) measurements have been intensively performed for superconducting thin films of YBa 2 Cu 3 O y fabricated on MgO (100) substrates and powder samples of LaSrCuO systems. In order to complement the study, we also review the NRMA of BiSrCaCuO system. A particular attention has been paid to the following phenomena: (i) phases, (ii) effect of current, (iii) directional effect of applied magnetic field, (iv) hysteresis, (v) microwave power absorbed as a function of magnetic field, (vi) linewidth in the vicinity of T c , and (vii) modulation amplitude effect. A preliminary study on ( La 0.98 Dy 0.02)1.85 Sr 0.15 CuO 4 was also reported.
ESR measurements have been carried out on La 0.7 Ca 0.3 MnO 3. Distorted signals have been observed below about 255 K, but clear signals above ≃ 270 K . The temperature dependence of the low-temperature ESR linewidth nearly follows the magnetization (or susceptibility). The ESR intensity exhibits an anomalous increase at temperatures between about 200 K and 260 K with a peak at around 250 K; quite similar behavior to that of the resistivity, indicating a possible correlation between the resistivity and the ESR intensity. The temperature dependence of the ESR linewidth and intensity has been also studied above 300 K.
In an attempt to produce superconductive films of large area, a study was made on the preparation of t h e films through laser post-treatment of plasma-sprayed oxide ceramic films. T h e ceramic powders of Bi-Sr-Ca-Cu-0 and Y-Ba-Cud systems were used as raw materials. Each ceramic powder was sprayed onto a stainless steel substrate followed by CO, laser beam irradiation with oxygen gas flow to remodify the composition and provide superconductive crystals on the film. The results showed that laser post-treatment can recover superconductive crystals on both films and can provide the transition temperatures T,,,,, on both systems and the critical temperature Tc,cnd, on the Bi-Sr-Ca-Cu4 system
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