Cooperative Jahn-Teller transition and resonant x-ray scattering in thin film<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LaMnO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Song, Ji Yeon; Park, J. H.; Lee, K.-B.; Lee, J. M.; Jeong, Yoon Hee

doi:10.1103/physrevb.66.020407

Cited by 13 publications

(6 citation statements)

References 23 publications

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“…To further check the accuracy of the PACBED derived structure, in Table I we present experimentally measured and theoretically calculated crystal parameters of bulk LaMnO 3 at room temperature together with our results [5,8,35]. In terms of Mn-O bonding distances, the PACBED results are consistent with the neutron diffraction results within a few picometers, which may come from surface reconstruction and relaxation due to the finite size of the TEM specimen.…”

supporting

confidence: 55%

“…The transmitted disk size is 9.7 mrad. [5,8,35]. It will be demonstrated that the JTD of octahedra in LaMnO 3 can be quantitatively measured by matching PACBED patterns in experimental and simulated PACBED patterns.…”

mentioning

confidence: 93%

“…While there are some reports of experimental measurements of octahedral bonding parameters in perovskites using neutron diffraction and resonant x-ray scattering techniques [5,8,9], these techniques have limited spatial resolution, making them ill suited for characterizing local properties at interfaces and other defects [2,10,11]. In contrast, aberrationcorrected scanning transmission electron microscopy (STEM) is extensively used for its ability to probe local phenomena [12,13].…”

mentioning

confidence: 99%

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Quantifying Jahn-Teller distortion at the nanoscale with picometer accuracy using position averaged convergent beam electron diffraction

Wang

Esser

Bagués

et al. 2019

Phys. Rev. Research

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Using position averaged convergent beam electron diffraction (PACBED) the Jahn-Teller distortion in LaMnO 3 is quantitatively measured using a straightforward pattern-matching approach. The fit between experimental patterns and PACBED patterns simulated using the quantum excitation of phonons model allows a three-dimensional measure of octahedral distortion and rotation information from the near transmitted disk region with picometer precision. The effects of plasmon and other inelastic components on quantification using this method are investigated and discussed. The results provide an avenue for accurate local studies of the crystal structure origins of emergent physics in parallel with high-resolution annular dark field scanning transmission electron microscopy imaging at interfaces and defects in quantum materials.

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confidence: 55%

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confidence: 93%

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confidence: 99%

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Quantifying Jahn-Teller distortion at the nanoscale with picometer accuracy using position averaged convergent beam electron diffraction

Wang

Esser

Bagués

et al. 2019

Phys. Rev. Research

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“…Experimentally, two early works from Raman spectroscopy [11] and from the analysis of the overall disorder in the EXAFS data across T * [12], supported the hypothesis of the upkeep of the local JT distortion. On the other hand the hypothesis that the local JT distortion may vanish and the Mn − O distances collapse, was sustained by the work in thin LaMnO 3 films [13]. The two distances found by the fitting procedure [13] collapse into a single one above a given temperature, in a similar way as the cell parameters.…”

Section: Introductionmentioning

confidence: 92%

Local atomic and electronic structure inLaMnO3across the orbital ordering transition

et al. 2004

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The local atomic disorder and the electronic structure in the environment of manganese atoms in LaMnO 3 has been studied by x-ray absorption spectroscopy, over a temperature range (300K to 870K) covering the orbital ordering transition (∼710K). The Mn-O distances splitting into short and long bonds (1.95 and 2.15Å) is kept across the transition temperature, so that the MnO 6 octahedra remain locally Jahn-Teller distorted. Discontinuities in the Mn local structure are identified in the extended x-ray fine structure spectra at this temperature, associated to a reduction of the disorder in the super-exchange angle and to the removal of the anisotropy in the radial disorder within the coordination shell. Subtle changes in the electronic local structure also take place at the Mn site at the transition temperature. The near edge spectra show a small drop of the Mn 4p−hole count and a small enhancement in the pre-edge structures at the transition temperature. These features are associated to an increase of the covalence of the Mn-O bonds. Our results shed light on the local electronic and structural phenomena in a model of order-disorder transition, where the cooperative distortion is overcome by the thermal disorder.

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“…This finding was supported by results obtained from different experimental techniques on La 0.95 Sr 0.05 MnO 3 single crystals, a series of Sr-doped powder samples and LaMnO 3 thin films. [16][17][18] Besides this general assessment concerning the character of the JT transition, the dynamical properties observed in a rather broad temperature range around T JT deserve a closer inspection. Recent Nuclear Magnetic Resonance (NMR) experiments 19 show changes in the spin-relaxation and the Knight-shift of the 17 O ligand ions already far below T JT , which are interpreted as a melting of the orbital order.…”

Section: Introductionmentioning

confidence: 99%

ESR evidence for partial melting of the orbital order inLaMnO3below the Jahn-Teller transition

et al. 2014

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We report on high-temperature electron spin resonance studies of a detwinned LaMnO3 single crystal across the Jahn-Teller transition at TJT = 750 K. The anisotropy of the linewidth and gfactor reflects the local Jahn-Teller distortions in the orbitally ordered phase. A clear jump in the linewidth accompanies the Jahn-Teller transition at TJT = 750 K confirming that the transition is of first order. Already at T * = 550 K a significant decrease of the reduced linewidth is observed. This temperature scale is discussed with respect to the interaction of the eg-electrons of the Mn 3+ -ions and the elastic field of the cooperative distortions. Our results support a partial melting of the orbital order along the antiferromagnetically coupled b-axis at T * . The remaining two-dimensional orbital ordering within the ferromagnetically coupled ac-plane finally disappears together with the cooperative distortion at TJT. Moreover in our discussion we show that elastic strain field interactions can explain the melting of the orbital order and, thus, has to be taken into account to explain the orbital ordering in LaMnO3.

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Cooperative Jahn-Teller transition and resonant x-ray scattering in thin filmLaMnO3

Cited by 13 publications

References 23 publications

Quantifying Jahn-Teller distortion at the nanoscale with picometer accuracy using position averaged convergent beam electron diffraction

Quantifying Jahn-Teller distortion at the nanoscale with picometer accuracy using position averaged convergent beam electron diffraction

Local atomic and electronic structure inLaMnO3across the orbital ordering transition

ESR evidence for partial melting of the orbital order inLaMnO3below the Jahn-Teller transition

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