Vibrational and elastic properties of hcp barium under pressure and their relation to its electronic structure

• Published in: Solid state communications Vol. 142; no. 1; pp. 41 - 44
• Main Authors: Olijnyk, H., Nakano, S., Takemura, K.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-04-2007; Elsevier
• Subjects: A. Metals; Condensed matter: structure, mechanical and thermal properties; D. Elasticity; D. Phonons; E. Strain, high pressure; Elasticity, elastic constants; Exact sciences and technology; Lattice dynamics; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Phonon states and bands, normal modes, and phonon dispersion; Phonons and vibrations in crystal lattices; Physics; 78.30.Er; 62.50.+p; 63.20.e; 78.30-j; E. Strain, high pressure; A. Metals; D. Phonons; D. Elasticity; Elastic modulus; Raman spectra; Barium; Pressure effects; Shear modulus; Grueneisen constant; Elasticity; High pressure; Equations of state; Phonon mode; Vibrational modes; HCP lattices; 62.50.+p; 63.20.e; 78.30.Er; 78.30-j; A. Metals; D. Phonons; D. Elasticity; E. Strain
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/j.ssc.2007.01.033

High-pressure Raman studies of both hexagonal-close-packed phases Ba-II and Ba-V are reported. Combining the
E
2
g
phonon data with the existing equation of state data, the pressure dependence of the elastic shear modulus
C
44
has been derived. The pressure shift of the
E
2
g
mode in both phases is discussed in terms of the elastic parameters. Though the pressure response of the observed Raman mode shows normal behaviour in both phases, more subtle differences can be traced back to differences of the electronic structure in both phases.