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

초록

2D correlation analysis is performed on the temperature-dependent Raman spectra of HoMnO3 thin films. As the temperature of the HoMnO3 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 similar to 70 K, the Neel 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 70K, while there is slight depletion of the spectral weight at 336, 656, and 1304 cm(-1) even at higher temperature than 70K. PCA scores and loading vectors plots also support these 2D correlation results. Our 20 correlation analysis supports the existence of the short range spin correlations between Mn sites in HoMnO3 even above the Neel temperature. (C) 2014 Elsevier B.V. All rights reserved.

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