2D COS and PCMW2D analysis of the magnetic transitions in Raman spectra of BiFeO3

Thi Minh Hien Nguyen, Xuan Nghia Nguyen, Van Minh Nguyen, Xuan Thang To, Duc Cuong Nguyen, Thi Huyen Nguyen, Xiang Bai Chen, In Sang Yang

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2 Scopus citations

Abstract

BiFeO3 is one of the most attracting materials because it is the only known room-temperature multiferroic material. It has been studied by Raman spectroscopy extensively. We perform two-dimensional correlation spectroscopy (2D COS) and perturbation-correlation moving window two-dimensional correlation spectroscopy (PCMW2D) analysis on the temperature-dependent Raman spectra of a BiFeO3 single crystal. The two low temperature spin reorientation transitions around 135 K and 190 K are confirmed through the significant change in phonon peaks from PCMW2D correlation spectra. We also identify the origin of the mode at ~ 1255 cm−1, which has been controversial until now. In our 2D COS analysis, the intensity of this mode has a strong correlation with the intensity of 145 and 176 cm−1 phonons which correspond to the vibration modes of the Bi-O and Fe-O chemical bonds. We propose that the mode at ~ 1255 cm−1 is the two-phonon scattering of the 551 cm−1 mode assisted by the 145 −176 cm−1 phonons.

Original languageEnglish
Article number103383
JournalVibrational Spectroscopy
Volume120
DOIs
StatePublished - May 2022

Bibliographical note

Funding Information:
This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under grand number 103.02-2018.39 . I-S. Y. was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( 2021R1A6A1A10039823 ).

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • Multiferroic BiFeO
  • Raman scattering, two-dimension correlation spectroscopy, perturbation-correlation moving window two-dimensional correlation spectroscopy

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