Inelastic-light-scattering study of magnon softening in ErFe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Koshizuka, N.; Ushioda, S.

doi:10.1103/physrevb.22.5394

Cited by 118 publications

(69 citation statements)

References 16 publications

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“…[11] The lines at about 1300 cm −1 were attributed to the twophonon scattering. [10] There is some controversies in the assignment of the mode around 620 cm −1 .…”

Section: Resultsmentioning

confidence: 97%

Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Cheng

Shen

et al. 2009

Asia-Pacific J Chem Eng

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Autocombustion of citric acid gel was employed to prepare ReFeO 3 (Re = Gd, Nd) nanocrystalline powders. The phase identification and lattice parameters were investigated by the X-ray diffraction (XRD). Fieldemission scanning electron microscopy (FESEM) investigations were carried out to examine the morphology and average size of these powders. Several one phonon lines, two-magnon excitation, and two-phonon scattering have been assigned in their Raman spectra. Both NdFeO 3 and GdFeO 3 nanocrystalline powders were single ReFeO 3 phase, which are agglomerated with average crystallite size of 70-90 nm. The investigations indicated that the autocombustion of citric acid gel method is an effective technology to prepare ReFeO 3 nanocrystalline powders. 

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“…[11] The lines at about 1300 cm −1 were attributed to the twophonon scattering. [10] There is some controversies in the assignment of the mode around 620 cm −1 .…”

Section: Resultsmentioning

confidence: 97%

Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Cheng

Shen

et al. 2009

Asia-Pacific J Chem Eng

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“…The low temperature Raman measurements allow direct comparison with first-principles calculations. According to group theory, orthorhombic Pnma structure should have 24 Raman modes, 7Ag + 5B1g + 7B2g + 5B3g [28][29][30]. The calculated peak position and intensity are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Chalcogenide perovskites – an emerging class of ionic semiconductors

et al. 2016

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“…Moreover, the second in intensity A g (1) line in YMnO 3 is also activated by D JT . On the other hand, in the Raman spectra of ABO 3 perovskites, containing non-JT ion in B-position (or an JT-ion, which does not produce large difference in the B-O2 distances, as is the case of Ti 3+ ), the B 2g (1) line is either weak or even not detectable (see, e.g., B = Al 25 , Sc 26,27 , Ti 28,29 , V 30 , Fe 31,32 , Ni 33 ). Therefore, it appears that the intensity of the B 2g (1) line can be used as a measure of the JT-distortion of the BO 6 octahedra.…”

Section: Discussionmentioning

confidence: 99%

Comparative Raman study of isostructural YCrO3and YMnO3: Effects of structural distortions and twinning

et al. 2011

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Polarized Raman spectra of isostructural orthorhombic YCrO 3 and YMnO 3 single crystals were collected at same conditions using different laser excitation in the visible range. The symmetry of the observed lines was determined and they were assigned to definite atomic vibrations based on lattice dynamical calculations. The frequencies of the lines of the same origin in both compounds are close, however, their intensities differ significantly. While the different intensity of the modes, activated by the Jahn-Teller distortion, can be explained by the different magnitude of this distortion in the two compounds, the cause of the reduced intensity of other lines in low frequency region in the Raman spectra of YMnO 3 is likely due to the fine twinning of the crystal. INTRODUCTIONThe interest in the transition-metal perovskite-like oxides ABO 3 continues for decades because of many attractive phenomena observed in these compounds. Among them are structural second-order phase transitions, high-T c superconductivity, colossal magnetoresistance, charge-and orbital-ordering, complex magnetic properties, etc. As a rule the structural, electrical and magnetic properties of these compounds are strongly correlated. They can be tuned through the change of the mismatch of the A-O and B-O bond lengths, expressed by the tolerance factor t = (R A + R O )/ √ 2(R B + R O ), where R O , R A and R B are the ionic radii of the oxygen and atoms in the A-and B-positions, respectively. Depending on the value of t, most of these compounds crystallize in superstructures of the ideal cubic perovskite (space group Pm3m) with R3c or Pnma symmetry. Using the model of Glazer 1 , treating the BO 6 octahedra as rigid ones, the superstructures can be obtained from the ideal cubic perovskite through some tilts (rotations) of the octahedra around the main crystallographic directions. In the Glazer's notations, the rhombohedral R3c structure is of (a − a − a − ) type and the orthorhombic Pnma structure is of (a − b + a − ) type.Raman spectroscopy is a powerful experimental technique for study of perovskite-like oxides. Due to the fact that there are no Raman-active modes in the ideal cubic perovskite, all observed lines in the one-phonon region of the Raman spectra of the real perovskites have to be connected to some deviations of the real structure from the ideal one. For example, as shown in the pioneering work of Scott 2 , one of the Raman-active modes in the rare-earth aluminates of R3c structure consists in a rigid octahedral tilt around [111] direction. This mode can be considered as a "soft mode" and its frequency goes to zero as the temperature approaches the critical temperature of the structural second-order phase transition. Iliev et al. 3 have shown that in the case of rare-earth manganites with orthorhombic Pnma structure, two of the observed lines in the Raman spectra originate from modes with a shape of the two static octahedral tilts, existing in the structure. Although that these compounds do not undergo second order transition to...

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Inelastic-light-scattering study of magnon softening in ErFeO3

Cited by 118 publications

References 16 publications

Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Chalcogenide perovskites – an emerging class of ionic semiconductors

Comparative Raman study of isostructural YCrO3and YMnO3: Effects of structural distortions and twinning

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Inelastic-light-scattering study of magnon softening in ErFeO3

Cited by 118 publications

References 16 publications

Preparation of ReFeO3 nanocrystalline powders by auto‐combustion of citric acid gel

Preparation of ReFeO3 nanocrystalline powders by auto‐combustion of citric acid gel

Chalcogenide perovskites – an emerging class of ionic semiconductors

Comparative Raman study of isostructural YCrO3and YMnO3: Effects of structural distortions and twinning

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Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel

Preparation of ReFeO₃ nanocrystalline powders by auto‐combustion of citric acid gel