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Throughout a complete Electron Spin Resonance (ESR) and magnetization studyof La0.5Ca0.5MnO3, we discuss about the nature of the complex phase-segregatedstate established in this compound below T~210 K. Between TN<T<TC, the ESRspectra shows two lines characteristic of two different magnetic phases. Fromthe resonance field (Hr) derived for each line we argue that theincommensurate-charge-ordering phase (ICO) which coexists withferromagnetic-metallic (FMM) clusters in this temperature interval, is mainlyparamagnetic and not antiferromagnetic. The FMM/ICO ratio can be tuned with arelatively small field, which suggests that the internal energy associated withthose phases is very similar. Below TN, there is an appreciable FM contributionto the magnetization and the ESR spectra indicates the presence of FM clustersin an antiferromagnetic matrix (canted). Our results show that ESR could be avery useful tool to investigate the nature of the phase-separated state nowbelieved to play a fundamental role in the physics of mixed valent manganites.Comment: 6 pages, 6 figure

Coexistence of paramagnetic-charge-ordered and ferromagnetic-metallic phases in La0.5Ca0.5MnO3 evidenced by electron spin resonance