Abstract
We performed multifrequency electron spin resonance (ESR) on the antiferromagnetic (TN = 160 K) and charge-ordered (T co = 250 K) insulating manganite Nd0.5Ca0.5MnO3. Temperature (4–300 K) and frequency (9.4–285 GHz) dependence of the linewidth, intensity and position of the ESR line were studied. In the paramagnetic state we observe a single Lorentzian absorption line. For a given frequency, the ESR line position is temperature independent (close tog = 1.99). A strong linewidth broadening is observed below Tco. This indicates that there is no magnetic order in the temperature rangeT cos> T >T N but strong antiferromagnetic fluctuations are present. Below TN, due to high-frequency and high-field ESR (up to 12 T) measurements, we were able to observe unexpected lines within the antiferromagnetic gap revealing the presence of a phase separation.
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Dupont, F., de Brion, S., Millange, F. et al. Multifrequency electron spin resonance study of the charge-ordered manganite Nd0.5Ca0.5MnO3 . Appl. Magn. Reson. 19, 485–493 (2000). https://doi.org/10.1007/BF03162392
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DOI: https://doi.org/10.1007/BF03162392