Complex magnetic behaviors and evidence of magnetic fluctuations in bilayered La2-2xSr1+2Mn2O7

S. Y. Wu, W. H. Li, K. C. Lee, H. D. Yang

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Neutron diffraction, ac magnetic susceptibility, and dc electric resistivity measurements were performed to study the structural, magnetic, and electric properties of naturally bilayered La2-2xSr1+2xMn2O7, with x = 0.3, 0.4, and 0.5. The ordering temperature of the Mn spins shifted to a higher temperature as the doping concentration was increased. Both ferromagnetic and antiferromagnetic correlations were evident. The predominant interaction in the x = 0.3 and 0.4 compounds was ferromagnetic, whereas it was antiferromagnetic in the x = 0.5 compound. Both the in-phase and out-of-phase susceptibilities showed complex patterns, indicating that the systems were magnetically very active. An external field as weak as 100 Oe strongly altered the susceptibility patterns. Magnetic fluctuations were evident at all temperatures studied. A structural change, which we believe to be induced by the charge ordering, occurred at around 220 K.

Original languageEnglish
Pages (from-to)282-292
Number of pages11
JournalChinese Journal of Physics
Issue number3
StatePublished - 2001


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