Complex Magnetic Behaviors and Evidence of Magnetic Fluctuations in Bilayered La2¡ 2xSr1+2xMn2O7

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.

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周冠圻（2015）。通道摻雜及低溫沉積介電層對多晶鍺無接面快閃記憶體元件特性研究〔碩士論文，國立清華大學〕。華藝線上圖書館。https://www.airitilibrary.com/Article/Detail?DocID=U0016-0312201510272339

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Complex Magnetic Behaviors and Evidence of Magnetic Fluctuations in Bilayered La2¡ 2xSr1+2xMn2O7

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