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Pseudo gap and its relation to anomalous features in underdoped Bi2212
Author(s) -
Machtoub L. H.,
Robinson L.,
Shimoyama J.,
Suemoto T.,
Kishio K.
Publication year - 2001
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.777
Subject(s) - raman spectroscopy , phonon , resonance (particle physics) , feature (linguistics) , similarity (geometry) , physics , condensed matter physics , intensity (physics) , distinctive feature , spectral line , raman scattering , mode (computer interface) , molecular vibration , relation (database) , nuclear magnetic resonance , materials science , atomic physics , quantum mechanics , computer science , data mining , image (mathematics) , operating system , linguistics , philosophy , artificial intelligence
We report detailed resonance Raman investigations of the pseudo gap and the anomalous modes observed in underdoped Bi 2 Sr 2 CaCu 2 O 8±δ . We observed similarity in the resonance profiles of the B 1 g 600 cm −1 peak and the A 1 g 630 cm −1 phonon mode, which provides strong evidence for the origin of the 600 cm −1 feature to be in some part a vibrational mode. At low temperatures we observed an increase in intensity in the feature and depletion in spectral weight. We attribute the origin of the anomalous feature to two independent components, vibrational and electronic, with coincidental overlapping. Copyright © 2001 John Wiley & Sons, Ltd.