Correlation between phase diagrams and spontaneous magnetization jumps in narrow-band manganites
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The correlation between the phase diagrams of narrow-band manganites and the abrupt magnetization jumps observed previously at a magnetic-field-induced transition from the antiferromagnetic to ferromagnetic state has been studied. This transition occurs during several milliseconds and is related to a spontaneous thermal avalanche; however, the mechanisms of the avalanche formation and development have not been conclusively established. It has been shown that different compositions (Pr0.67Ca0.33MnO3, Sm0.55Sr0.45Mn18O3, and Eu0.58Sr0.42MnO3) are qualitatively characterized by analogous phase diagrams with a negative incline of the antiferromagnet/ferromagnet interface in the H-T plane; apparently, this analogy determines the avalanche-like character of the transition.
KeywordsManganite Matter Mater Ferromagnetic State Russian Research Centre Kurchatov Institute Metamagnetic Transition
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