Raman spectroscopy of low-temperature<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>P</mml:mi><mml:mi>n</mml:mi><mml:mi>m</mml:mi><mml:mi>a</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math>and high-temperature<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>R</mml:mi><mml:mover accent="true"><mml:mn>3</mml:mn><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mi>c</mml:mi><mml:mo>)</m

Iliev, M. N.; Litvinchuk, A. P.; Hadjiev, V. G.; Wang, Y.-Q.; Cmaidalka, J.; Meng, R.L.; Sun, Yanyi; Kolev, Nikolay Ivanov; Abrashev, M. V.

doi:10.1103/physrevb.74.214301

Cited by 77 publications

(60 citation statements)

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“…B 1g ) [12]. As confirmed in papers [12,14,20], the modes of B 2g and B 3g symmetry have very low intensity. Moreover, the Raman modes grouped in brackets have very similar wavenumbers because they correspond to the same atomic movements around the x or y axis.…”

Section: Resultsmentioning

confidence: 57%

“…rotations of BO 6 octahedra around the cubic [001] c and [110] c axes, Jahn-Teller distortion, and La/Sr shift from its position in the ideal perovskite lattice. Analysis of literature data [14][15][16] implies that Raman spectra of La 1-x Sr x Ga 1-y Mn y O 3 crystals of Pbnm structure will be dominated by the modes activated by [110] c rotation and Jahn-Teller distortions.…”

Section: Resultsmentioning

confidence: 99%

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Perovskite La1−x Sr x Ga1−y Mn y O3 solid solution crystals: Raman spectroscopy characterization

Runka

Berkowski

2012

J Mater Sci

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The first-order orthorhombic-rhombohedral phase transition of La 1-x Sr x Ga 1-y Mn y O 3 (LSGMn) crystals is studied by Raman spectroscopy. An increase in Mn content causes significant changes in Raman spectra, especially in the high-wavenumber spectral range. The Raman spectrum of La 1-x Sr x Ga 1-y Mn y O 3 compound with x = y = 0.02 is dominated by MnO 6 internal vibrations. Moreover, a change in the spectrum of this crystal is observed when the 785-nm excitation line is used. Essential reduction in the number of Raman modes during the phase transition is experimentally observed. The temperature of the phase transition decreases with increasing Sr and Mn contents, at the rate of about 20 K/at%.

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Section: Resultsmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Perovskite La1−x Sr x Ga1−y Mn y O3 solid solution crystals: Raman spectroscopy characterization

Runka

Berkowski

2012

J Mater Sci

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show abstract

“…Unfortunately the crystallites used in this study were very small and twinned, precluding the identification of the crystal axis and a distinction between the different phonon symmetries could not be made. However, it has previously been shown that P nma perovskites primarily grow with faces in the pseudocubic ac plane 40 with P nma-ac = 7A g + 7B 2g = 14. The I mma phase exhibits a drastic reduction in the number of observable modes as compared to the P nma phase, to 3A g + 2B 1g in the ab plane, 3Ag + 3B 2g in the ac plane, and 3A g + 4B 1g in the bc plane, while the R3c phase always exhibits at least 13 vibrational modes regardless of crystal face.…”

Section: X-ray Diffraction Resultsmentioning

confidence: 99%

Structural and magnetic properties of isovalently substituted multiferroic BiFeO3: Insights from Raman spectroscopy

et al. 2012

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“…These two distortions together govern the symmetry lowering from an ideal cubic perovskites type ( 3 ) to orthorhombic type (Pnma) and activate zone-centre Raman modes. 28 Group theory suggests 24 Raman active modes for orthorhombic Pnma with four formula units in the unit cell: [29] 7A g +5B 1g +7B 2g +5B 3g (1) 100 200 300 400 500 600…”

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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Raman spectroscopy of low-temperature(Pnma)and high-temperature(R3¯c)

Cited by 77 publications

References 14 publications

Perovskite La1−x Sr x Ga1−y Mn y O3 solid solution crystals: Raman spectroscopy characterization

Perovskite La1−x Sr x Ga1−y Mn y O3 solid solution crystals: Raman spectroscopy characterization

Structural and magnetic properties of isovalently substituted multiferroic BiFeO3: Insights from Raman spectroscopy

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

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Raman spectroscopy of low-temperature(Pnma)and high-temperature(R3¯c)

Cited by 77 publications

References 14 publications

Perovskite La1−x Sr x Ga1−y Mn y O3 solid solution crystals: Raman spectroscopy characterization

Perovskite La1−x Sr x Ga1−y Mn y O3 solid solution crystals: Raman spectroscopy characterization

Structural and magnetic properties of isovalently substituted multiferroic BiFeO3: Insights from Raman spectroscopy

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

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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