Electron spin resonance of manganite included into the perovskite composite in millimeter waveband

The micro- and nano- composites performed on the basis of crystals having the perovskite-type structure attract attention of researchers due to that their properties, which can be easy varied by the rather small external affect (for inst. the magnetic field, the strength, the temperature). In particular, artificially synthesized manganites-perovskites (with the general formula La_1-xA_xMnO₃ where the A- is the alkaline earth element) are good candidates for studying effects of so-called colossal magnetoresistance (CMR). It is known that the significant variation of perovskites properties takes place due to the strong short-range competing interactions (the exchange one first of all) in their atomic structure.In this work, composites containing submicron Y₁Ba₂Cu₃O_7-x powder and La_0.7Sr_0.3MnO₃ (LSMO) nanoparticles (about 20-30 nm in size) have been produced.