Phenomenological Description of the Acoustic Phonon Branch of K_2SeO_4
スポンサーリンク
概要
- 論文の詳細を見る
A phenomenological approach is used in investigating dispersion of the acoustic phonon branch of K_2SeO_4 in the extended zone scheme. The dispersion is expressed through coefficients of a simple thermodynamic potential. According to symmetry of the crystal (D_2h = mmm) the Lifshitz-type invariant exists in the potential. This invariant is responsible for the linear and dynamical interaction of the acoustic and optical branches. The soft optical branch lowering with decreasing temperature forces to lower the acoustic branch which becomes zero at some value of the wave vector.
- Taylor and Francisの論文
Taylor and Francis | 論文
- Crystallization of α and γ phases in isotactic polypropylene with low ethylene content : isothermal crystallization and secondary crystallization
- Mean-Field Description of Structural Phase Transitions in a Hypercubic Lattice Model
- Quantum effects of phase transitions in ferroelectric crystals : experiments and models
- Rotational Displacement of IO_4 Tetrahedron in the Phase II of Pyridinium Periodate
- Quantum susceptibility for structural transitions based on exact solutions of the Schrodinger equation