TY - JOUR
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
UR - http://www.scopus.com/inward/record.url?scp=84901623641&partnerID=8YFLogxK
U2 - 10.1016/j.molstruc.2014.02.007
DO - 10.1016/j.molstruc.2014.02.007
M3 - Article
AN - SCOPUS:84901623641
VL - 1069
SP - 280
EP - 283
JO - Journal of Molecular Structure
JF - Journal of Molecular Structure
SN - 0022-2860
IS - 1
ER -