The temperature dependence of the magnetic moment measured by a superconducting quantum interference device magnetometer in La_1-xNaₓMnO₃ (x=0.1,0ex0ex0.15,0ex0ex0.2) ferromagnetic perovskites is compared with the temperature dependence of the NMR frequency on ⁵⁵Mn and ¹³⁹La nuclei. In the region close to TC, the NMR relaxation rate is also determined. From the results it follows that the phase transition is continuous for all Na concentrations studied.
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Savosta et al. (1998) studied this question.
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