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Phonon Modes in Yb 3 Al 5 O 12 : Pressure Dependence and Model Calculations
Author(s) -
Papagelis K.,
Kanellis G.,
Arvanitidis J.,
Ves S.,
Kourouklis G.A.
Publication year - 2001
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 - 10.1002/1521-3951(200101)223:1<343::aid-pssb343>3.0.co;2-2
Subject(s) - raman spectroscopy , degenerate energy levels , phonon , diamond anvil cell , hydrostatic pressure , diamond , hydrostatic equilibrium , condensed matter physics , materials science , volume (thermodynamics) , crystal (programming language) , thermodynamics , high pressure , physics , optics , composite material , quantum mechanics , computer science , programming language
The Raman modes of Yb 3 Al 5 O 12 single crystals and their pressure dependence up to 11 GPa are reported. The hydrostatic pressure was applied at room temperature by using a diamond anvil cell (DAC). As the crystal volume decreases all Raman peaks exhibit positive pressure slopes (∂ ω /∂ P ) which vary from 0.5 to 5.6 cm –1 /GPa. The Raman peak at 362 cm –1 is not split in this system, retaining a degenerate behavior, which is opposite to that observed for other members of the rare earth garnets. Model calculations based on the Lennard‐Jones potential provide the phonon eigenvectors and their frequencies which are in satisfactory agreement with the experimental values.