Infrared Active Phonons and Optical Band Gap in Multiferroic GdMnO₃ Studied by Infrared and UV-Visible Spectroscopy

• Authors: S. Bukhari , J. Ahmad
• Languages of publication: EN

Abstracts

EN

Optical properties of multiferroic GdMnO₃ synthesized by sol-gel method have been investigated by measuring the infrared reflectivity and UV-visible absorption spectra. The infrared reflectivity spectrum of polycrystalline GdMnO₃ in the frequency range 30-7500 cm^{-1} at room temperature contains several phonon modes. The resonant frequency of observed infrared active phonon modes is found comparable with theoretically predicted results. Mean Born effective charges are calculated and discussed in view of the origin of ferroelectricity in GdMnO₃. Three strong absorption peaks observed in the UV-visible spectrum are attributed to the Mn (3d)-electron transitions. The optical band gap ≈1.2 eV is estimated from UV-visible absorption spectrum using Tauc's relation. GdMnO₃ seems to behave like an indirect gap semiconductor.

Keywords

EN

63.20.-e; 78.20.-e; 72.20.-i; 73.20.Mf

Discipline

• 73.20.Mf: Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)(for collective excitations in quantum Hall effects, see 73.43.Lp)
• 78.20.-e: Optical properties of bulk materials and thin films(for optical properties related to materials treatment, see 81.40.Tv; for optical materials, see 42.70-a; for optical properties of superconductors, see 74.25.Gz; for optical properties of rocks and minerals, see 91.60.Mk; for optical properties of specific thin films, see 78.66.-w)
• 63.20.-e: Phonons in crystal lattices(for phonons in superconductors, see 74.25.Kc; see also 43.35.Gk Phonons in crystal lattice, quantum acoustics—in Acoustics Appendix)
• 72.20.-i: Conductivity phenomena in semiconductors and insulators(see also 66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves)

• Journal: Acta Physica Polonica A
• Year: 2016
• Volume: 129
• Issue: 1
• Pages: 43-48

Dates

published

2016-01

received

2014-11-07

(unknown)

2015-12-09

Contributors

author

S. Bukhari

• Solid State Spectroscopy Laboratory, Department of Physics, Bahauddin Zakariya University, Multan 60800, Pakistan

author

J. Ahmad

• Solid State Spectroscopy Laboratory, Department of Physics, Bahauddin Zakariya University, Multan 60800, Pakistan

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Identifiers

DOI

10.12693/APhysPolA.129.43