Temperature studies of multiferroic TbMnO$_3$ with resonant Raman scattering

ORAL

Abstract

Using temperature dependent resonant Raman scattering with different excitation energies from the ultraviolet (UV) to near infrared (NIR), we have investigated the complex interplay between the orbital, structural and magnetic ordering in the multiferroic material TbMnO$_3$. Depending on the scattering geometry, the magnetic transition at the N\'{e}el temperature at 41 K or the ferroelectric transition at T$_f$ = 28 K is observed. In resonance studies with an incident frequency of 1.91 eV, the Jahn-Teller mode shows a strong softening below T$_N$. In the low frequency spectra, a quasielastic response is identified. The results give information about the electron-phonon coupling and the correlations between electronic and structural degrees of freedom that contribute to the multiferroic behavior in TbMnO$_3$.

–

Authors

  • Ilka Mahns

    • University of Hamburg
    • IAP, University of Hamburg, Germany

  • M. Bastjan

    • IAP, University of Hamburg, Germany

  • B. Schulz

    • Institute of Applied Physics, University of Hamburg, D-20355 Hamburg, Germany
    • University of Hamburg
    • IAP, University of Hamburg, Germany

  • S. Mueller

    • IAP, University of Hamburg, Germany

  • A. Rusydi

    • University of Hamburg
    • IAP, University of Hamburg, Germany

  • M. Ruebhausen

    • University of Hamburg
    • IAP, University of Hamburg, Germany

  • N. Aliouane

    • Hahn-Meitner-Institut
    • HMI, Berlin, Germany

  • D.N. Argyriou

    • Hahn-Meitner-Institut, 100 Glienicker str, Berlin, Germany
    • HMI
    • Hahn-Meitner-Institut, Glienicker Str. 100, Berlin D-14109, Germany
    • Hahn-Meitner-Institut
    • HMI, Berlin, Germany

  • H. Barath

    • Dept. of Physics and Frederick Seitz Materials Research Laboratory, Univ. of Ill., Urbana-Champaign
    • Dept. of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Illinois

  • M. Kim

    • Dept. of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at UC
    • Dept. of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Illinois

  • S.L. Cooper

    • University of Illinois at Urbana-Champaign
    • Dept. of Physics and Frederick Seitz Materials Research Laboratory, Univ. of Ill., Urbana-Champaign
    • Dept. of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Illinois