2D correlation analysis of the magnetic excitations in Raman spectra of HoMnO3

Thi Huyen Nguyen; Thi Minh Hien Nguyen; Xiang Bai Chen; In Sang Yang; Yeonju Park; Young Mee Jung

doi:10.1016/j.molstruc.2014.02.007

2D correlation analysis of the magnetic excitations in Raman spectra of HoMnO₃

Thi Huyen Nguyen, Thi Minh Hien Nguyen, Xiang Bai Chen, In Sang Yang, Yeonju Park, Young Mee Jung

Department of Physics

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

2D correlation analysis is performed on the temperature-dependent Raman spectra of HoMnO₃ thin films. As the temperature of the HoMnO ₃ thin films decrease, the depletion of the spectral weight at 336, 656, and 1304 cm^-1 occurs at higher temperatures than the increase of the intensity at 508, 766, and 945 cm^-1 below ∼70 K, the Néel temperature. The power spectrum asserts that all the changes in the spectral weight are strongly correlated. Most of the temperature-induced spectral changes of HoMnO₃ occur at lower temperature than 70 K, while there is slight depletion of the spectral weight at 336, 656, and 1304 cm^-1 even at higher temperature than 70 K. PCA scores and loading vectors plots also support these 2D correlation results. Our 2D correlation analysis supports the existence of the short range spin correlations between Mn sites in HoMnO₃ even above the Néel temperature.

Original language	English
Pages (from-to)	280-283
Number of pages	4
Journal	Journal of Molecular Structure
Volume	1069
Issue number	1
DOIs	https://doi.org/10.1016/j.molstruc.2014.02.007
State	Published - 8 Jul 2014

Bibliographical note

Funding Information:
Research at Ewha Womans University was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2008-0061893 ).

Keywords

2D correlation spectroscopy
Néel temperature
Principal component analysis
Raman spectroscopy
Short-range spin correlation

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10.1016/j.molstruc.2014.02.007

Cite this

@article{ada13f6cf69749f585c02701862d3e1f,

title = "2D correlation analysis of the magnetic excitations in Raman spectra of HoMnO3",

abstract = "2D correlation analysis is performed on the temperature-dependent Raman spectra of HoMnO3 thin films. As the temperature of the HoMnO 3 thin films decrease, the depletion of the spectral weight at 336, 656, and 1304 cm-1 occurs at higher temperatures than the increase of the intensity at 508, 766, and 945 cm-1 below ∼70 K, the N{\'e}el temperature. The power spectrum asserts that all the changes in the spectral weight are strongly correlated. Most of the temperature-induced spectral changes of HoMnO3 occur at lower temperature than 70 K, while there is slight depletion of the spectral weight at 336, 656, and 1304 cm-1 even at higher temperature than 70 K. PCA scores and loading vectors plots also support these 2D correlation results. Our 2D correlation analysis supports the existence of the short range spin correlations between Mn sites in HoMnO3 even above the N{\'e}el temperature.",

keywords = "2D correlation spectroscopy, N{\'e}el temperature, Principal component analysis, Raman spectroscopy, Short-range spin correlation",

author = "Nguyen, {Thi Huyen} and Nguyen, {Thi Minh Hien} and Chen, {Xiang Bai} and Yang, {In Sang} and Yeonju Park and Jung, {Young Mee}",

note = "Funding Information: Research at Ewha Womans University was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2008-0061893 ).",

year = "2014",

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T1 - 2D correlation analysis of the magnetic excitations in Raman spectra of HoMnO3

AU - Nguyen, Thi Huyen

AU - Nguyen, Thi Minh Hien

AU - Chen, Xiang Bai

AU - Yang, In Sang

AU - Park, Yeonju

AU - Jung, Young Mee

N1 - Funding Information: Research at Ewha Womans University was supported in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2008-0061893 ).

PY - 2014/7/8

Y1 - 2014/7/8

N2 - 2D correlation analysis is performed on the temperature-dependent Raman spectra of HoMnO3 thin films. As the temperature of the HoMnO 3 thin films decrease, the depletion of the spectral weight at 336, 656, and 1304 cm-1 occurs at higher temperatures than the increase of the intensity at 508, 766, and 945 cm-1 below ∼70 K, the Néel temperature. The power spectrum asserts that all the changes in the spectral weight are strongly correlated. Most of the temperature-induced spectral changes of HoMnO3 occur at lower temperature than 70 K, while there is slight depletion of the spectral weight at 336, 656, and 1304 cm-1 even at higher temperature than 70 K. PCA scores and loading vectors plots also support these 2D correlation results. Our 2D correlation analysis supports the existence of the short range spin correlations between Mn sites in HoMnO3 even above the Néel temperature.

AB - 2D correlation analysis is performed on the temperature-dependent Raman spectra of HoMnO3 thin films. As the temperature of the HoMnO 3 thin films decrease, the depletion of the spectral weight at 336, 656, and 1304 cm-1 occurs at higher temperatures than the increase of the intensity at 508, 766, and 945 cm-1 below ∼70 K, the Néel temperature. The power spectrum asserts that all the changes in the spectral weight are strongly correlated. Most of the temperature-induced spectral changes of HoMnO3 occur at lower temperature than 70 K, while there is slight depletion of the spectral weight at 336, 656, and 1304 cm-1 even at higher temperature than 70 K. PCA scores and loading vectors plots also support these 2D correlation results. Our 2D correlation analysis supports the existence of the short range spin correlations between Mn sites in HoMnO3 even above the Néel temperature.

KW - 2D correlation spectroscopy

KW - Néel temperature

KW - Principal component analysis

KW - Raman spectroscopy

KW - Short-range spin correlation

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