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The role played by the Nd ions in the magnetic properties of Nd0.5Ca0.5MnO3and Nd0.7Ca0.3MnO3 is studied using static magnetization, neutron diffractionand high frequency (9.4-475GHz) Electron Spin Resonance. We show that the Ndions are weakly coupled to the Mn ions via ferromagnetic exchange and areresponsible for the peculiar ferromagnetic resonance observed in the FM phaseof both compounds (ground state below 120K for x=0.3, high field state forx=0.5). We then use ESR to look for magnetic phase separation in the low field,CO phase of Nd0.5Ca0.5MnO3. We show that there is no trace of the FM phaseimbedded in the CO phase, contrary to what is observed in La0.5Ca0.5MnO3 orPr0.5Sr0.5MnO3.Comment: to be published in phys.Rev.B as a Rapid Com

physical review. b, condensed matter

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Influence of Nd on the magnetic properties ofNd1−xCax…