Phonon properties of CoSb2 single crystals

Area of Science:

• Condensed Matter Physics
• Materials Science
• Spectroscopy

Background:

• Understanding phonon properties is crucial for predicting material behavior.
• Cobalt antimonide (CoSb2) is a material with potential thermoelectric applications.
• Lattice dynamics calculations and Raman spectroscopy are key tools for phonon analysis.

Purpose of the Study:

• To investigate the phonon properties of CoSb2.
• To experimentally verify theoretical predictions of phonon modes.
• To elucidate the interactions governing temperature-dependent phonon behavior.

Main Methods:

• Raman scattering spectroscopy was employed to probe phonon excitations.
• Lattice dynamics calculations were performed to model phonon behavior.
• Factor-group analysis was used to predict and assign Raman active modes.

Main Results:

• Sixteen of eighteen predicted Raman active modes in CoSb2 were experimentally observed and assigned.
• Excellent agreement was found between calculated and measured phonon energies at the Γ point.
• Temperature dependence of A(g) symmetry modes was accurately described by phonon-phonon interactions.

Conclusions:

• The study successfully characterized the phonon spectrum of CoSb2.
• Phonon-phonon interactions are the dominant mechanism for temperature effects on specific phonon modes.
• The findings validate theoretical models and provide insights into CoSb2's thermal properties.