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First‐ and second order Raman scattering in Sb and Bi at high pressure
Author(s) -
Olijnyk H.,
Nakano S.,
Takemura K.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200642467
Subject(s) - raman spectroscopy , phonon , monoclinic crystal system , raman scattering , context (archaeology) , anisotropy , thermal expansion , ambient pressure , condensed matter physics , chemistry , materials science , crystal structure , crystallography , optics , physics , thermodynamics , geology , composite material , paleontology
Sb and Bi were investigated by high‐pressure Raman spectroscopy in their low pressure phases. One‐ and two‐phonon spectra were measured in the stability field of the A7 structure. The optical zone‐centre modes of monoclinic Bi‐II were obtained for the first time and have been monitored over an extended pressure range. The pressure response of the observed phonon modes, which is qualitatively similar for both substances, is discussed within the context of the anisotropic bonding properties and their gradual lowering under compression. At ambient conditions in both substances the contributions to the temperature shift of both Raman modes due to thermal expansion are much smaller than the explicit contributions. In contrast to Bi‐I, there is evidence that in Sb‐I both phonon–phonon‐ and electron–phonon interactions significantly increase with the application of pressure. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)