PCMW2D and 2D Raman correlation spectroscopy evidence for presence of spin-phonon coupling in hexagonal LuMnO3

Thi Minh Hien Nguyen, Xuan Nghia Nguyen, Thi Huyen Nguyen, Thi Kim Oanh Vu, Duc Huy Le, Van Minh Nguyen, In Sang Yang, Sang Wook Cheong

Research output: Contribution to journalArticlepeer-review

Abstract

Two-dimensional correlation spectroscopy (2D-COS) and perturbation-correlation moving window two-dimensional correlation spectroscopy (PCMW2D) analysis are performed on the temperature-dependent Raman spectra of hexagonal LuMnO3 single crystal. Under the resonance with the on-site Mn d-d transitions, the correlation between the phonons which are relate to the vibration of Mn ions’ bonds and spin-excitation peaks suggest a strong spin-phonon coupling in LuMnO3. The PCMW2D results clearly show that the significant change in phonons and spin-excitation peaks occurs around the Néel temperature and the spin reorientation transition. The multiple components in the broad spin-excitation peaks also suggest variations in spin symmetries in the ground state. Furthermore, we propose that the 2D-COS and PCMW2D Raman correlation spectroscopies provide a simple and powerful method for investigating the couplings and the transitions, which would be very important for understanding systematically the magnetoelectric properties of multiferroic materials.

Original languageEnglish
Article number122753
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume297
DOIs
StatePublished - 5 Sep 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Hexagonal LuMnO
  • Perturbation-correlation moving window two-dimensional correlation spectroscopy
  • Raman scattering
  • Spin phonon coupling
  • Two-dimension correlation spectroscopy

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