Orbital polarization of LaSrMnO4 studied by soft X-ray linear dichroism

Wu, Wen Bin; Huang, D. J.; Guo, Guang‐Yu; Lin, Hong‐Ji; Hou, Te-Chien; Chang, C. F.; Chen, C.T.; Fujimori, A.; Kimura, T.; Huang, He-Liang; Tanaka, A.; Jo, Takeo

doi:10.1016/j.elspec.2004.02.072

Cited by 18 publications

(7 citation statements)

References 26 publications

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“…While for σ polarization the measured intensity 7 corresponds directly to E x, the intensity for E z is deduced from I z = 4/3I π -1/3I x , with I π being the measured intensity with π polarization. 26 Reflected intensities have been measured with a diode and were corrected by the fluorescence background, measured independently with a second diode. All intensities have been normalized by the incoming intensity measured with a gold mesh.…”

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confidence: 99%

Orbital reflectometry of oxide heterostructures

et al. 2011

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Orbital reflectometry of oxide heterostructures

et al. 2011

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“…We examined the XAS at the O K -edge where the dipole transition from the occupied O 1s to unoccupied O 2p orbitals occurs. Since the pre-edge at the absorption threshold (∼529 eV) is determined by hybridized states between the Mn 3d and O 2p orbitals, the features of the lowest unoccupied x 2 – y 2 or y 2 – z 2 are reflected in the pre-edge of the O K -edge spectra. Accordingly, we were able to observe the anisotropic hybridizations and relevant pre-edge shifts using two polarization directions, that is, E //[001] O and E //[1̅10] O (see Figure a).…”

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Orbital Order Melting at Reduced Dimensions

et al. 2022

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The orbital degree of freedom, strongly coupled with the lattice and spin, is an important factor when designing correlated functions. Whether the long-range orbital order is stable at reduced dimensions and, if not, what the critical thickness is remains a tantalizing question. Here, we report the melting of orbital ordering, observed by controlling the dimensionality of the canonical eg 1 orbital system LaMnO3. Epitaxial films are synthesized with vertically aligned orbital ordering planes on an orthorhombic substrate, so that reducing film thickness changes the two-dimensional planes into quasi-one-dimensional nanostrips. The orbital order appears to be suppressed below the critical thickness of about six unit cells by changing the characteristic phonon modes and making the Mn d orbital more isotropic. Density functional calculations reveal that the electronic energy instability induced by bandwidth narrowing via the dimensional crossover and the interfacial effect causes the absence of orbital order in the ultrathin thickness.

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“…While for σ polarization the measured intensity corresponds directly to E x, the intensity for E z is deduced from I z = 4/3I π -1/3I x , with I π being the measured intensity with π polarization. 26 Reflected intensities have been measured with a diode and were corrected by the fluorescence background, measured independently with a second diode. All intensities have been normalized by the incoming intensity measured with a gold mesh.…”

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confidence: 99%

Orbital reflectometry

Benckiser,

Haverkort,

Brueck

et al. 2011

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The occupation of d-orbitals controls the magnitude and anisotropy of the inter-atomic electron transfer in transition metal oxides and hence exerts a key influence on their chemical bonding and physical properties. 1,2 Atomic-scale modulations of the orbital occupation at surfaces and interfaces are believed to be responsible for massive variations of the magnetic and transport properties, 3-9 but could thus far not be probed in a quantitative manner. Here we show that it is possible to derive quantitative, spatially resolved orbital polarization profiles from soft x-ray reflectivity data, without resorting to model calculations. We demonstrate that the method is sensitive enough to resolve differences of ∼ 3% in the occupation of Ni e g orbitals in adjacent atomic layers of a LaNiO 3 -LaAlO 3 superlattice, in good agreement with ab-initio electronic-structure calculations. The possibility to quantitatively correlate theory and experiment on the atomic scale opens up many new perspectives for orbital physics in d-electron materials.

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Orbital polarization of LaSrMnO4 studied by soft X-ray linear dichroism

Cited by 18 publications

References 26 publications

Orbital reflectometry of oxide heterostructures

Orbital reflectometry of oxide heterostructures

Orbital Order Melting at Reduced Dimensions

Orbital reflectometry

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