Excitations of the Orbital Order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi><mml:msub><mml:mrow><mml:mi>MnO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>Manganites: Light Scattering Experiments

Martı́n-Carrón, L.; Andrés, A. de

doi:10.1103/physrevlett.92.175501

Cited by 33 publications

(20 citation statements)

References 17 publications

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“…Our calculation predicts the lowest quintuplet, which corresponds to the splitting of the e g subshell, at about 1.9 eV. Recently, a Jahn-Teller splitting of the order of 2 eV was derived from resonant Raman scattering data [52,53]. A large Jahn-Teller splitting is also in agreement with the absence of low-energy orbiton features in inelastic x-ray data [70].…”

Section: Orbitons Versus Multiphonon Peaks In Lamnosupporting

confidence: 81%

“…At 160 meV, similar two-phonon features are observed also in other pseudo-cubic perovskites such as LaCoO 3 [51] orYTiO 3 (see figure 6). Three-phonon Raman scattering in LaMnO 3 at room temperature and above has been reported recently in the range 210-250 meV [53]. Multiphonon Raman scattering is predicted to be strong in orbitally ordered LaMnO 3 due to the Franck-Condon effect [128] (see figure 3).…”

Section: Orbitons Versus Multiphonon Peaks In Lamnomentioning

confidence: 88%

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Optical study of orbital excitations in transition-metal oxides

et al. 2005

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Collective orbital excitations in orbitally ordered YVO3 and HoVO3 E Benckiser, R Rückamp, T Möller et al. Abstract. The orbital excitations of a series of transition-metal compounds are studied by means of optical spectroscopy. Our aim was to identify signatures of collective orbital excitations by comparison with experimental and theoretical results for predominantly local crystal-field excitations. To this end, we have studied TiOCl, RTiO 3 (R = La, Sm and Y), LaMnO 3 , Y 2 BaNiO 5 , CaCu 2 O 3 and K 4 Cu 4 OCl 10 , ranging from early to late transition-metal ions, from t 2g to e g systems, and including systems in which the exchange coupling is predominantly three-dimensional, one-dimensional or zero-dimensional. With the exception of LaMnO 3 , we find orbital excitations in all compounds. We discuss the competition between orbital fluctuations (for dominant exchange coupling) and crystal-field splitting (for dominant coupling to the lattice). Comparison of our experimental results with configuration-interaction cluster calculations in general yields good agreement, demonstrating that the coupling to the lattice is important for a 7 Author to whom any correspondence should be addressed. quantitative description of the orbital excitations in these compounds. However, detailed theoretical predictions for the contribution of collective orbital modes to the optical conductivity (e.g. the line shape or the polarization dependence) are required to decide on a possible contribution of orbital fluctuations at low energies, in particular, in case of the orbital excitations at ≈0.25 eV in RTiO 3 . Further calculations are called for which take into account the exchange interactions between the orbitals and the coupling to the lattice on an equal footing. Contents

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Section: Orbitons Versus Multiphonon Peaks In Lamnosupporting

confidence: 81%

Section: Orbitons Versus Multiphonon Peaks In Lamnomentioning

confidence: 88%

Optical study of orbital excitations in transition-metal oxides

et al. 2005

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“…These results are consistent with the experiments conducted with a 632 nm laser [6,7,12]. This is because our calculation assumes the Mott-Hubbard transition at 2 eV as the intermediate state excitation.…”

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confidence: 91%

“…However, other researchers suspected that the weak signal is due to the first overtones of fundamental phonon modes [5]. Until recently, studies on the Raman scattering signal of LaMnO 3 remained controversial despite the accumulation of precise spectroscopic studies for high-quality crystals of LaMnO 3 and its relatives [6][7][8]. The origin of the high frequency Raman mode that Saitoh et al, highlighted is an important question, but a more important question would be how we understand 3 the fundamental modes of a Raman scattering spectrum in orbitally degenerate Mott insulators.…”

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confidence: 99%

Orbital wave in the Raman scattering cross section of LaMnO3

Munkhbaatar

Myung-Whun

2018

Phys. Rev. B

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We calculated the polarization-dependent Raman scattering cross section spectra of LaMnO 3 below the A-type magnetic ordering temperature. Two strong peaks appear around the MnO 6 octahedra stretching phonon frequency. One mode shows A g symmetry, while the other mode shows B g symmetry. We found that the A g symmetry peak is a Jahn-Teller phonon coupled to the orbital wave and the B g symmetry peak is an orbital wave coupled to a Q 2 phonon mode via the Jahn-Teller electron-phonon coupling.

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“…This is because the FC mechanism is asserted to be mainly responsible for the observed multi-phonon scattering. 9,14 In this local mechanism, higher-order scattering usually shows up at integer multiples of one-phonon peak energy, as the FC process results from a displacement of the intermediate electronic state from the initial one rather than a simultaneous emission of n-phonons. Thus, this feature enables us to check the validity of the FC mechanism.…”

Section: Resultsmentioning

confidence: 99%

Orbiton-mediated multiphonon scattering inLa1−xSrxMnO3

et al. 2005

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We report on Raman scattering measurements of single crystalline La1−xSrxMnO3 (x=0, 0.06, 0.09 and 0.125), focusing on the high frequency regime. We observe multi-phonon scattering processes up to fourth-order which show distinct features: (i) anomalies in peak energy and its relative intensity and (ii) a pronounced temperature-, polarization-, and doping-dependence. These features suggest a mixed orbiton-phonon nature of the observed multi-phonon Raman spectra.

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Excitations of the Orbital Order inRMnO3Manganites: Light Scattering Experiments

Cited by 33 publications

References 17 publications

Optical study of orbital excitations in transition-metal oxides

Optical study of orbital excitations in transition-metal oxides

Orbital wave in the Raman scattering cross section of LaMnO3

Orbiton-mediated multiphonon scattering inLa1−xSrxMnO3

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