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- W2005496103 abstract "We investigated orbital ordering states in the vicinity of the Mott transition in $Rmathrm{Ti}{mathrm{O}}_{3}$ and $mathrm{La}mathrm{Ti}{mathrm{O}}_{3.02}$ ($R=mathrm{Gd}$,Sm,Nd,La) using resonant x-ray scattering (RXS) at the $1sensuremath{rightarrow}3d$ transition energy of the $K$ absorption edge of Ti. We measured the energy and azimuthal angle dependences of the resonant signal at the reflections of $Q=(1phantom{rule{0.3em}{0ex}}0phantom{rule{0.3em}{0ex}}0)$, (0 1 1), and (0 0 1). The RXS intensity gradually decreased with decreasing the $mathrm{Gd}mathrm{Fe}{mathrm{O}}_{3}$-type distortion. Although there is a magnetic phase boundary between $mathrm{Gd}mathrm{Ti}{mathrm{O}}_{3}$ (ferromagnet) and $mathrm{Sm}mathrm{Ti}{mathrm{O}}_{3}$ (antiferromagnet), the ratio among the magnitudes at those reflections was almost the same. The azimuthal angle dependence also showed an identical periodicity at each scattering vector. With further decreasing the $mathrm{Gd}mathrm{Fe}{mathrm{O}}_{3}$-type distortion, the magnitude of the RXS in $mathrm{La}mathrm{Ti}{mathrm{O}}_{3}$ became small and almost isotropic. This means that the orbital state of $mathrm{La}mathrm{Ti}{mathrm{O}}_{3}$ is different from those of $Rmathrm{Ti}{mathrm{O}}_{3}$ ($R=mathrm{Y}$,Gd,Sm). Furthermore, when we approached the Mott transition by hole doping, the signal of the RXS disappeared in $mathrm{La}mathrm{Ti}{mathrm{O}}_{3.02}$, which is just located on the metal-insulator boundary. This indicates a disappearance of the orbital ordering at the Mott transition." @default.
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- W2005496103 date "2004-12-30" @default.
- W2005496103 modified "2023-10-17" @default.
- W2005496103 title "Orbital ordering near a Mott transition: Resonant x-ray scattering study of the perovskite Ti oxidesRTiO3andLaTiO3.02(R=Gd, Sm, Nd, and La)" @default.
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- W2005496103 doi "https://doi.org/10.1103/physrevb.70.245125" @default.
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