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Structural symmetry changes in SmB6 - 2D correlation spectroscopy and principal component analysis

Title
Structural symmetry changes in SmB6 - 2D correlation spectroscopy and principal component analysis
Authors
Nguyen T.H.Nguyen T.M.H.Kang B.Cho B.Park Y.Jung Y.M.Yang I.-S.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
2018
Journal Title
Journal of Molecular Structure
ISSN
0022-2860JCR Link
Citation
Journal of Molecular Structure vol. 1165, pp. 84 - 89
Keywords
2D correlation spectroscopy (2DCOS)Overlapped peaksPrincipal component analysis (PCA)Raman spectroscopySmB6
Publisher
Elsevier B.V.
Indexed
SCI; SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
2D correlation analysis (2DCOS) and principal component analysis (PCA) have been performed on temperature-dependent Raman spectra from 12 K to 300 K of SmB6 single crystals grown from Boron with a purity of 99.9% (3N) or 99.9999% (6N). Significant differences in the Raman spectra of SmB6(3N) and SmB6(6N) are observed. The Raman active T2g, Eg, and A1g modes of SmB6(3N) are broader and shift to higher wavenumbers compared with those of SmB6(6N). The results of 2DCOS and PCA on temperature-dependent Raman spectra of SmB6(3N) and SmB6(6N) give us further information. We find that all the T2g, Eg, and A1g modes of SmB6(6N) are single bands, while those of SmB6(3N) show all doublet features. The appearance of multiple bands in Raman vibrational modes of SmB6(3N) sample implies that the structure of boron octahedra of the SmB6(3N) has lower symmetry than that of SmB6(6N). Our findings in 2DCOS and PCA of the Raman spectra strongly support the differences in the behavior of SmB6(3N) and SmB6(6N). © 2018 Elsevier B.V.
DOI
10.1016/j.molstruc.2018.03.106
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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