Phonon Raman scattering of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi></mml:math>CrO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>perovskites (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="normal">Y</mml:mi></mml:mrow></mml:math>, La, Pr, Sm, Gd, Dy, Ho, Yb, Lu)

Weber, Mads C.; Kreisel, J.; Thomas, Pam A.; Newton, Mark E.; Sardar, Kripasindhu; Walton, Richard I.

doi:10.1103/physrevb.85.054303

Cited by 179 publications

(129 citation statements)

References 56 publications

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“…1). This is similar to observations for other rare earth perovskites, where the Raman spec- trum of the lanthanum member is systematically different when compared to the remaining members of the series [15,17,41]. This will be elaborated on later in the discussion.…”

Section: B Raman Spectra and Mode Assignmentsupporting

confidence: 72%

“…The evolution shows the expected linear relation between the vibrational frequencies and the tilt angles of the RFeO 3 . This adds further support to the proposed soft-modelike relation of tilt frequency and size of the rare earth, not only in the orthoferrites, but also for other families where this behavior has been experimentally verified: orthomanganites [15], orthochromates [17], orthoscandates [16] among others [18]. However, at variance with these previous experimental data, our work on orthoferrites show two additional features that have to be commented on, namely that i) the two tilt modes follow two different lines and ii) LaFeO 3 deviates significantly from the general linear behaviour.…”

Section: B Raman Spectra and Mode Assignmentsupporting

confidence: 51%

“…Alternatively, Raman spectroscopy (RS) is a well-known technique to follow tilt-driven soft mode phase transitions [12][13][14]. More recently, it has been shown that RS is also an appropriate probe for the investigation of lattice distortions and slight changes in octahedra rotations [15][16][17][18]. Further to this, RS is an ideal probe for the investigation of spinphonon coupling phenomena [19][20][21][22][23].…”

Section: +mentioning

confidence: 99%

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Raman spectroscopy of rare-earth orthoferrites RFeO3 ( R =La, Sm, Eu, Gd, Tb, Dy)

et al. 2016

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We report a Raman scattering study of six rare earth orthoferrites RFeO3, with R = La, Sm, Eu, Gd, Tb, Dy. The use of extensive polarized Raman scattering of SmFeO3 and first-principles calculations enable the assignment of the observed phonon modes to vibrational symmetries and atomic displacements. The assignment of the spectra and their comparison throughout the whole series allows correlating the phonon modes with the orthorhombic structural distortions of RFeO3 perovskites. In particular, the positions of two specific Ag modes scale linearly with the two FeO6 octahedra tilt angles, allowing the distortion throughout the series. At variance with literature, we find that the two octahedra tilt angles scale differently with the vibration frequencies of their respective Ag modes. This behavior as well as the general relations between the tilt angles, the frequencies of the associated modes and the ionic radii are rationalized in a simple Landau model. The reported Raman spectra and associated phonon-mode assignment provide reference data for structural investigations of the whole series of orthoferrites.

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Section: B Raman Spectra and Mode Assignmentsupporting

confidence: 72%

Section: B Raman Spectra and Mode Assignmentsupporting

confidence: 51%

Section: +mentioning

confidence: 99%

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Raman spectroscopy of rare-earth orthoferrites RFeO3 ( R =La, Sm, Eu, Gd, Tb, Dy)

et al. 2016

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“…The detailed analysis of the mode assignment exists elsewhere; [14,30] for the sake of continuity we provide here a discussion on the certain important modes used in our discussion as seen in Figure 1. The sharp and intense modes below 200 cm -1 are related to R-ion vibrations and are expected to be less affected by the orthorhombic distortion.…”

Section: Raman Scattering Studiesmentioning

confidence: 99%

“…[30] In Ref. [30], it is mentioned that as the octahedral rotation angle (or the tilt angles "φ" ad "θ") increases, the frequency of the soft modes A g (2) and A g (4) also increases.…”

Section: Raman Scattering Studiesmentioning

confidence: 99%

Effect of pressure on octahedral distortions inRCrO₃(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications

Bhadram

Swain

Dhanya

et al. 2014

Mater. Res. Express

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Abstract:The effect of rare-earth ion size on the octahedral distortions in rare-earth chromites (RCrO 3 , R = Lu, Tb, Gd, Eu, Sm) crystallizing in the orthorhombic structure has been studied using Raman scattering and synchrotron powder x-ray diffraction up to 20 GPa. From our studies on RCrO 3 we found that the octahedral tilts (distortions) increase with pressure. This is contrary to the earlier report which suggests that in LaCrO 3 , the distortions decrease with pressure leading to a more ordered phase at high pressure. Here we observe that the rate of increase in distortion decreases with the increase in R-ion radii. This occurs due to the reduction in the compression of RO 12 polyhedra with a corresponding increase in the compression of the CrO 6 octahedra with increasing R-ion radii. From the Raman studies, we predict a critical R-ion radii, above which we expect the distortions in RCrO 3 to reduce with increasing pressure leading to what is observed in the case of LaCrO 3 . These Raman results are consistent with our pressure dependent structural studies on RCrO 3 (R = Gd, Eu, Sm). Also, our results suggest that the pressure dependence of Néel temperature, T N Cr , (where the Cr 3+ spin orders) in RCrO 3 is mostly affected by the compressions of Cr-O bonds rather than the alteration of octahedral tilts.

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Local A‐Site Layering in Rare‐Earth Orthochromite Perovskites by Solution Synthesis

Daniels

Kashtiban

Kepaptsoglou

et al. 2016

Chemistry A European J

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Cation size effects were examined in the mixed A‐site perovskites La0.5Sm0.5CrO3 and La0.5Tb0.5CrO3 prepared through both hydrothermal and solid‐state methods. Atomically resolved electron energy loss spectroscopy (EELS) in the transmission electron microscope shows that while the La and Sm cations are randomly distributed, increased cation‐radius variance in La0.5Tb0.5CrO3 results in regions of localised La and Tb layers, an atomic arrangement exclusive to the hydrothermally prepared material. Solid‐state preparation gives lower homogeneity resulting in separate nanoscale regions rich in La3+ and Tb3+. The A‐site layering in hydrothermal La0.5Tb0.5CrO3 is randomised upon annealing at high temperature, resulting in magnetic behaviour that is dependent on synthesis route.

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Phonon Raman scattering ofRCrO3perovskites (R=Y, La, Pr, Sm, Gd, Dy, Ho, Yb, Lu)

Cited by 179 publications

References 56 publications

Raman spectroscopy of rare-earth orthoferrites RFeO3 ( R =La, Sm, Eu, Gd, Tb, Dy)

Raman spectroscopy of rare-earth orthoferrites RFeO3 ( R =La, Sm, Eu, Gd, Tb, Dy)

Effect of pressure on octahedral distortions inRCrO₃(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications

Local A‐Site Layering in Rare‐Earth Orthochromite Perovskites by Solution Synthesis

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Phonon Raman scattering ofRCrO3perovskites (R=Y, La, Pr, Sm, Gd, Dy, Ho, Yb, Lu)

Cited by 179 publications

References 56 publications

Raman spectroscopy of rare-earth orthoferrites RFeO3 ( R =La, Sm, Eu, Gd, Tb, Dy)

Raman spectroscopy of rare-earth orthoferrites RFeO3 ( R =La, Sm, Eu, Gd, Tb, Dy)

Effect of pressure on octahedral distortions inRCrO3(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications

Local A‐Site Layering in Rare‐Earth Orthochromite Perovskites by Solution Synthesis

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Product

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Effect of pressure on octahedral distortions inRCrO₃(R= Lu, Tb, Gd, Eu, Sm): the role ofR-ion size and its implications