Abstract
We have measured the paramagnetic (PM) resonance behavior as a function of temperature for various manganese perovskites (La,Y)2/3(Ca,Ba)1/3MnO3 with an average A-site size 〈rA〉 basically covering the whole region of ferromagnetic (FM) metallic ground state. We show that at least three regions with different magnetic behaviors can be distinguished by two phase lines: Tonset−〈rA〉 and Tc−〈rA〉. For each given 〈rA〉, the complete PM and long-range FM behaviors appear above Tonset and below Tc, respectively; while some anomalous PM behaviors appear for the intermediate temperature range of Tonset<T<Tc . A possible magnetic transition process is discussed in order of decreasing temperature from high-T complete paramagnetism to low-T long-range ferromagnetism.
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