Phonon–Phason Coupling Strength in a Tsai-Type Ag–In–Yb Icosahedral Quasicrystal

Owing to the quasiperiodic order, one independent term in elasticity of quasicrystals (phonon–phason coupling) is characteristic quasicrystals. It not seen conventional crystals and has continued be a significant subject research field Recently, novel method was applied Mackay-type Al–Pd–Mn icosahedral quasicrystal prove existence phonon–phason coupling evaluate its strength based on This study Tsai-type Ag–In–Yb system strength. We phonon strain at temperature with active phason, induction phason successfully detected evaluated using powder X-ray diffraction. elastic constant 0.17 ± 0.04 GPa by quantitatively comparing measured induced our calculation results.