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Journal Articles

Electronic excitations in hole-doped La$$_{1-x}$$Sr$$_{x}$$MnO$$_{3}$$ studied by resonant inelastic X-ray scattering

Ishii, Kenji; Inami, Toshiya; Owada, Kenji; Kuzushita, Kaori; Mizuki, Junichiro; Murakami, Yoichi; Ishihara, Sumio*; Endo, Yasuo*; Maekawa, Sadamichi*; Hirota, Kazuma*; et al.

Journal of Physics and Chemistry of Solids, 66(12), p.2157 - 2162, 2005/12

https://doi.org/10.1016/j.jpcs.2005.09.011
 Times Cited Count：0 Percentile：0.00(Chemistry, Multidisciplinary)

We have studied electronic excitations of hole-doped manganese oxides La$$_{1-x}$$Sr$$_x$$MnO$$_3$$ ($$x=0.2$$ and $$0.4$$) by resonant inelastic X-ray scattering at Mn K absorption edge. We observed in the excitation spectra that the Mott gap of La$$_{0.6}$$Sr$$_{0.4}$$MnO$$_{3}$$ was filled by hole-doping. In La$$_{0.8}$$Sr$$_{0.2}$$MnO$$_{3}$$, which shows a metal-insulator transition, we found that temperature dependence of scattering intensity is different between two scattering vectors. It may reflects a anisotropic electronic structure which originates from the orbital degrees of freedom in manganese oxides.

Journal Articles

Resonant inelastic X-ray scattering study of the hole-doped manganites La$$_{1-x}$$Sr$$_x$$MnO$$_3$$ ($$x=0.2$$, $$0.4$$)

Ishii, Kenji; Inami, Toshiya; Owada, Kenji; Kuzushita, Kaori; Mizuki, Junichiro; Murakami, Yoichi; Ishihara, Sumio*; Endo, Yasuo*; Maekawa, Sadamichi*; Hirota, Kazuma*; et al.

Physical Review B, 70(22), p.224437_1 - 224437_6, 2004/12

https://doi.org/10.1103/PhysRevB.70.224437
 Times Cited Count：23 Percentile：67.95(Materials Science, Multidisciplinary)

Electronic excitations in the hole doped manganese oxides (La$$_{1-x}$$Sr$$_x$$MnO$$_3$$, $$x=0.2$$ and $$0.4$$) have been elucidated by using the resonant inelastic X-ray scattering (RIXS) method. A doping effect in the strongly correlated electron systems has been observed for the first time. The scattering spectra show that a salient peak appears in low energies indicating the persistence of the Mott gap. At the same time, the energy gap is partly filled by doping holes and the spectral weight energy shifts toward lower energies. The excitation spectra show little change in the momentum space as is in undoped LaMnO$$_3$$. On the other hand, the scattering intensities in the low energy excitations of $$x=0.2$$ are anisotropic in temperature dependence, which indicates an anisotropy of magnetic interaction and underlying effect of the orbital.

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