2D COS and PCMW2D analysis of the magnetic transitions in Raman spectra of BiFeO 3

被引：4

作者：

Nguyen, Thi Minh Hien ^{[1
]}

Nguyen, Xuan Nghia ^{[1
]}

Nguyen, Van Minh ^{[2
]}

To, Xuan Thang ^{[3
]}

Nguyen, Duc Cuong ^{[4
]}

Nguyen, Thi Huyen ^{[5
]}

Chen, Xiang Bai ^{[6
]}

Yang, In -Sang ^{[5
]}

机构：

[1] Vietnam Acad Sci & Technol, Inst Phys, 10 Dao Tan, Hanoi, Vietnam

[2] Hanoi Natl Univ Educ, Fac Phys, 136 Xuan Thuy, Hanoi, Vietnam

[3] Vietnam Acad Sci & Technol, Inst Mat Sci, 18 Hoang Quoc Viet, Hanoi, Vietnam

[4] Vietnam Natl Univ, VNU Univ Engn & Technol, Fac Engn Phys & Nanotechnol, Hanoi 10000, Vietnam

[5] Ewha Womans Univ, Dept Phys, Seoul 03760, South Korea

[6] Wuhan Inst Technol, Hubei key Lab Opt Informat & Pattern Recognit, Wuhan 43025, Peoples R China

来源：

VIBRATIONAL SPECTROSCOPY | 2022年 / 120卷

基金：

新加坡国家研究基金会;

关键词：

Multiferroic BiFeO 3; Raman scattering; two-dimension correlation; spectroscopy; perturbation-correlation moving; window two-dimensional correlation; SPECTROSCOPY; SCATTERING;

D O I：

10.1016/j.vibspec.2022.103383

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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.

引用

页数：7

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