ESR Studies of Layered-Perovskite Manganites R_<0.5>Sr_<1.5>MnO_4 (R = La, Nd)

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ESR studies have been performed on single crystals of laycrcd-perovskite manganites R_<0.5>Sr_<1.5>MnO_4 (R = La, Nd). An anisotropic ESR signal with extremely broad linewidth is observed and ascribed to thesingle-ion-anisotropic D term. For La_<0.5>Sr_<1.5>MnO_4, the spin susceptibility χ_sdeviates from the Curic-Weiss-like behavior and the peak-to-pcak lincwidth ΔH_<pp> shows a broad maximum at the charge-ordering temperature T_<co>(≈217K). With further decrease of temperature below I60K, χ_s decreases and ΔH_<pp> increases rapidly due to the spin order at the Neel temperature T_<N>(≈110K). These anomalies areabsent in Nd_<0.5>Sr_<1.5>MnO_4, which does not show the charge-ordering nor the spin-ordering. On the basisof these experimental data, we will discuss the charge and spin order of La_<0.5>Sr_<1.5>MnO_4.MnO.
社団法人日本物理学会の論文
2003-03-15