Raman evidence for Orbiton-Mediated Multiphonon Scattering in Multiferroic TbMnO${}_3$

Abstract

Temperature-dependent Raman spectra of TbMnO${}_3$ from 5 K to 300 K in the spectral range of 200 to 1525 cm${}^{-1}$ show five first-order Raman allowed modes and two high frequency modes. The intensity ratio of the high frequency Raman band to the corresponding first order Raman mode is nearly constant and high ($\sim$ 0.6) at all temperatures, suggesting a orbiton-phonon mixed nature of the high frequency mode. One of the first order phonon modes shows anomalous softening below T${}_N$ ($\sim$ 46 K), suggesting a strong spin-phonon coupling.

14 pages, 3 figures, 1 table

References in corpus (14)

• Possible evidence for electromagnons in multiferroic manganites
• Raman phonons as a probe of disorder, fluctuations and local structure in doped and undoped orthorhombic and rhombohedral manganites
• Origin of electromagnon excitations in \textit{R}MnO${}_3$
• Determinative Role of the Jahn-Teller Disorder in the Raman Scattering of Mixed-Valence Manganites
• Self-trapped Exciton and Franck-Condon Spectra Predicted in LaMnO${}_3$
• Colossal magnon-phonon coupling in multiferroic Eu${}_{0.75}$Y${}_{0.25}$MnO${}_3$
• Magnetic and magnetoelectric excitations in TbMnO${}_3$
• Orbital excitations in LaMnO${}_3$
• Spin-Charge-Lattice Coupling through Resonant Multi-Magnon Excitations in Multiferroic BiFeO3
• Multi-phonon Resonant Raman Scattering Predicted in LaMnO3 from the Franck-Condon Process via Self-Trapped Excitons
• New features in the phase diagram of TbMnO${}_3$
• Existence of orbital polarons in ferromagnetic insulating La${}_{1-x}$Sr${}_x$MnO${}_3$ (0.11$<x<$0.14) evidenced by giant phonon softening
• Orbiton-mediated multi-phonon scattering in La${}_{1-x}$Sr${}_x$MnO${}_3$
• Temperature-Dependent Infrared Reflectivity Studies of Multiferroic TbMnO_{3}: Evidence for Spin-Phonon Coupling

Cited by in corpus (6)

• Temperature dependent magnetic, dielectric and Raman studies of partially disordered La2NiMnO6
• Coupled Phonons, Magnetic Excitations and Ferroelectricity in AlFeO3: Raman and First-principles Studies
• Lattice-Mediated Magnetic Order Melting in TbMnO3
• Phonon Anomalies, Orbital-Ordering and Electronic Raman Scattering in iron-pnictide Ca(Fe0.97Co0.03)2As2: Temperature-dependent Raman Study
• Raman Evidence for Superconducting Gap and Spin-Phonon Coupling in Superconductor Ca(Fe0.95Co0.05)2As2
• Superconducting Fluctuations and Anomalous Phonon Renormalization much above superconducting transition temperature in Ca4Al2O5.7Fe2As2