Electron spin resonance study of Y1−xCaxMnO3

ESR spectra were measured in the series Y1−xCaxMnO3 (YCa) (0⩽x⩽1) obtaining the dependences with x and T. Anomalies detected in the ESR parameters (resonance field, line width and line intensity) allowed us to determine magnetic and structural transitions. We have constructed a phase diagram T vs. x in order to contrast ESR results with those obtained by susceptibility and X-ray diffraction.