Abstract
AbstractA combined study of La0.67Ca0.33Mn0.9757Fe0.03O3 compound by means of zero field 55Mn and 57Fe NMR as well as 57Fe Mössbauer spectroscopy (MS) is reported. The 55Mn NMR spectra exhibit a single double exchange (DE) line up to the magnetic ordering temperature (T C), 200 K, determined from magnetization measurements. The hyperfine field (HFF) remains finite at the T C, which reveals discontinuous character of the transition and the occurrence of a ferromagnetic‐paramagnetic phase segregation. The 57Fe MS HFF decreases much faster with increasing temperature than the 55Mn NMR HFF. Application of a molecular field model to the temperature dependence of the 55Mn and 57Fe HFF allows to estimate values of the Mn–Mn and the Fe–Mn exchange integrals, which amount to 1.24 meV and –0.6 meV, respectively. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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