Abstract
The X-band antiferromagnetic resonance (AFMR) spectrum of KMnF3 with Li+ and Na+ impurities was studied at temperatures from 40 K to TN. From comparison of the AFMR measurements with results of X-ray studies for the same good-quality crystals it was found that complete coincidence between the magnetic and structural phase transitions does not occur. It was also ascertained that, for T<TN, low-temperature magnetic phase transitions are highly sensitive to the presence of even small quantities of impurities. Consequently, these transitions depend markedly on the quality of the samples analysed.
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