High frequency magneto-impedance of double perovskite La1.2Sr1.8Mn2O7: secondary transitions at high temperatures
P. V. Patanjali, P. Theule, Z. Zhai, N. Hakim, S. Sridhar, R. Suryanarayanan, M. Apostu, G. Dhalenne, A. Revcolevschi
Abstract
Radio frequency magneto-impedance measurements clearly reveal a pronounced anomaly at 260K besides the main MI transition at 125K in the double perovskite material La1.2Sr1.8Mn2O7. This feature is not seen clearly in static resistivity and magnetization measurements. We suggest that this anomaly represents short range magnetic correlations enhanced at radio frequencies, with the easy axis along the c-axis .
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