<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>La</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>VO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>: Effects of doping on orbital ordering

Yano, Suguru; Louca, Despina; Neuefeind, Jöerg C.; Yan, Jiusheng; Zhou, Jianshi; Goodenough, John B

doi:10.1103/physrevb.90.214111

Cited by 15 publications

(16 citation statements)

References 36 publications

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“…Isolated polarons generate incoherent diffuse scattering in insulating vanadates (see Ref. [41]) but do not significantly affect the Bragg reflections studied in our crystallographic analysis. A direct observation of lattice polaron formation in the local structure of La 1−x Ca x MnO 3 was reported earlier [42].…”

Section: Discussionmentioning

confidence: 65%

Spin and orbital disordering by hole doping inPr1−xCaxVO3<

et al. 2016

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High-resolution powder x-ray diffraction and single-crystal neutron diffraction were used to investigate the crystal structure and magnetic ordering of the compound Pr 1−x Ca x VO 3 (0 x 0.3), which undergoes an insulator-to-metal transition for x ∼ 0.23. Since the ionic radii of Pr 3+ and Ca 2+ are almost identical and structural disorder is minimal, Pr 1−x Ca x VO 3 is a good model system for the influence of hole doping on the spin and orbital correlations in transition metal oxides. The end member PrVO 3 is a Mott-Hubbard insulator, which exhibits a structural phase transition at T S = 180 K from an orthorhombic to a monoclinic structure with space groups Pbnm and P 2 1 /b, respectively. This transition is associated with the onset of orbital ordering and strong Jahn-Teller distortions of the VO 6 octahedra. Antiferromagnetic C-type order with vanadium moments oriented in the ab plane is observed below T N = 140 K. Upon cooling, the vanadium moments induce a progressive magnetic polarization of the praseodymium sublattice, resulting in a ferrimagnetic structure with coexisting modes (C x , F y ) and (F x , C y ). In the insulating range of the Pr 1−x Ca x VO 3 phase diagram, Ca doping reduces both the orbital and magnetic transition temperatures so that T S = 108 K and T N = 95 K for x = 0.20. The Jahn-Teller distortions and ordered vanadium moments also decrease upon doping. In a metallic sample with x = 0.30, Jahn-Teller distortions and long-range orbital ordering are no longer observable, and the average crystal structure remains orthorhombic down to low temperature. However, broadening of some lattice Bragg reflections indicate a significant increase in lattice strain. Antiferromagnetic short-range order with a weak ordered moment of 0.14(3) μ B per vanadium atom could still be observed on the vanadium site below T ∼ 60 K. We discuss these observations in terms of doping-induced spin-orbital polaron formation.

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Section: Discussionmentioning

confidence: 65%

Spin and orbital disordering by hole doping inPr1−xCaxVO3<

et al. 2016

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“…It was recently found that in single crystals of Y 1−x La x VO 3 , G-type OO is present locally above the T OO temperature, but it is short range. 34 We also measured Raman scattering spectra of LaVO 3 films grown on STO(100) substrate down to 87 K (not shown). SrTiO 3 is not a good substrate for Raman investigations of thin films samples because it exhibits multiple phonon modes and a strong Raman background that substantially hinder Raman-based thin film experiments.…”

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confidence: 99%

Probing orbital ordering in LaVO3 epitaxial films by Raman scattering

et al. 2016

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Single crystals of Mott-Hubbard insulator LaVO3 exhibit spin and orbital ordering along with a structural change below ≈140 K. The occurrence of orbital ordering in epitaxial LaVO3 films has, however, been little investigated. By temperature-dependent Raman scattering spectroscopy, we probed and evidenced the transition to orbital ordering in epitaxial LaVO3 film samples fabricated by pulsed-laser deposition. This opens up the possibility to explore the influence of different epitaxial strain (compressive vs. tensile) and of epitaxy-induced distortions of oxygen octahedra on the orbital ordering, in epitaxial perovskite vanadate films.

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“…However, this is not clear in the case of Y 1−x La x TiO 3 . In a related compound, YVO 3 (3d 2 ) a transition to a G-type orbital order (G-OO) occurs at T OO ∼ 200 K, followed by a C -type AFM spin order at T N ∼ 116 K (C-SO) and finally to an orbital flip transition at T CG ∼ 77 K with C -type orbital order (C-OO) and G-type spin order (G-SO) [21][22][23] . Moreover, these transitions are coupled to structural ones.…”

Section: An Important Parameter Is the Ti-o-ti Bond Angle That Bends mentioning

confidence: 99%

Lattice and magnetic dynamics in perovskite Y1−xLaxTiO3

Louca

Niedziela

et al. 2016

Phys. Rev. B

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Inelastic neutron scattering combined with the dynamic pair density function (DPDF) analysis were used to investigate the magnetic and lattice dynamics in the orbitally active Y1−xLaxTiO3 as it crosses the antiferromagnetic (AFM) to ferromagnetic (FM) phase boundary. Upon doping, the FM state present in YTiO3 is suppressed on approaching a critical concentration of xc ∼ 0.3 in which TC 0, and is replaced by the AFM phase of LaTiO3. Below xc, magnetic scattering from spin waves is dominant at low energies. At xc with a TC 0, magnetic scattering is also observed and is most likely due to AFM fluctuations. At the same time, local atomic fluctuations extending to 50 meV are observed above and below the magnetic transitions from 0 ≤ x ≤ 1 that show distinct characteristics with x. From Y to La, a clear difference is observed in the phonon density of states (DOS) as a function of doping as well. At x = 0.15 and 0.3, low energy modes involving predominantly the rare-earth ion become suppressed with increasing temperature while in x = 1, strong suppression of phonon modes across a wide range in energy is observed above TN . It is likely that in the Y heavy samples, phonon modes below 20 meV have a stronger influence on the orbital excitations, while in LaTiO3, a strong phonon dependence is observed upon cooling up to TN .

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Y1−xLaxVO3: Effects of doping on orbital ordering

Cited by 15 publications

References 36 publications

Spin and orbital disordering by hole doping inPr1−xCaxVO3<

Spin and orbital disordering by hole doping inPr1−xCaxVO3<

Probing orbital ordering in LaVO3 epitaxial films by Raman scattering

Lattice and magnetic dynamics in perovskite Y1−xLaxTiO3

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