Zone center phonons of the orthorhombic RMnO3(R = Pr, Eu, Tb, Dy, Ho) perovskites

Gupta, H.C.; Tripathi, Upendra M.

doi:10.1186/1754-0429-1-9

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…The frequencies of the phonon modes at 10 K are reported in Table I and compared to the previous experimental results of J. Laverdière et al 33 at 5 K and M. N. Iliev et al 34 at room temperature. The theoretical calculations of H. C. Gupta et al 35 and R. Choithrani et al 36 are also reporter in Table I. In addition to the preview experimental results, we have measured the phonon modes at low frequency below 200 cm −1 .…”

Section: B Phonon Modesmentioning

confidence: 87%

Electromagnon and phonon excitations in multiferroic TbMnO3

et al. 2012

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We have performed Raman measurements on TbMnO3 single crystal under magnetic field along the three crystallographic directions. The flip of the spin spiral plane creates an electromagnon excitation. In addition to the electromagnons induced by the Heisenberg coupling, we have detected the electromagnon created by the Dzyaloshinskii-Moriya interaction along the c axis. We have identified all the vibrational modes of TbMnO3. Their temperature dependences show that only one phonon observed along the polarization axis is sensitive to the ferroelectric transition. This mode is tied to the Tb 3+ ion displacements that contribute to the ferroelectric polarization.

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Section: B Phonon Modesmentioning

confidence: 87%

Electromagnon and phonon excitations in multiferroic TbMnO3

et al. 2012

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Spin-phonon coupling and high-pressure phase transitions ofRMnO3(R=Caand Pr): An inelastic neutron scattering and first-principles study

et al. 2016

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We report inelastic neutron scattering measurements over 7-1251 K in CaMnO 3 covering various phase transitions, and over 6-150 K in PrMnO 3 covering the magnetic transition. The excitations around 20 meV in CaMnO 3 and at 17 meV in PrMnO 3 at low temperatures are found to be associated with magnetic origin. We observe coherent magnetic neutron scattering in localized regions in reciprocalspace and show it to arise from long-range correlated magnetic spin-waves below the magnetic transition temperature (T N ) and short-range stochastic spin-spin fluctuations above T N. In spite of similarity of the structure of the two compounds, the neutron inelastic spectrum of PrMnO 3 exhibits broad features at 150 K unlike well-defined peaks in the spectrum of CaMnO 3 . This might result from the difference in nature of interactions in the two compounds (magnetic and Jahn-Teller distortion). Abinitio phonon calculations have been used to interpret the observed phonon spectra. The ab-initio calculations at high pressures show that the variations of Mn-O distances are isotropic for CaMnO 3 and highly anisotropic for PrMnO 3 . The calculation in PrMnO 3 shows the suppression of Jahn-Teller distortion and simultaneous insulator to metal transition. It appears that this transition may not be associated with the occurrence of the tetragonal phase above 20 GPa as reported in the literature, since the tetragonal phase is found to be dynamically unstable although it is found to be energetically favored over the orthorhombic phase above 20 GPa. CaMnO 3 does not show any phase transition up to 60 GPa.

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Structural and electrical properties of polycrystalline Bi(Fe0.6Mn0.4)O3 thin films

Kim

Lee

et al. 2013

Journal of the Korean Physical Society

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Zone center phonons of the orthorhombic RMnO3(R = Pr, Eu, Tb, Dy, Ho) perovskites

Cited by 3 publications

References 21 publications

Electromagnon and phonon excitations in multiferroic TbMnO3

Electromagnon and phonon excitations in multiferroic TbMnO3

Spin-phonon coupling and high-pressure phase transitions ofRMnO3(R=Caand Pr): An inelastic neutron scattering and first-principles study

Structural and electrical properties of polycrystalline Bi(Fe0.6Mn0.4)O3 thin films

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