抄録
In Pt films, unusual strain dependence of elastic stiffness has been reported. In this study, we investigate elastic property of Pt films at high pressures to evaluate strain dependence of elastic stiffness. Pt film deposited on Si substrate is strained in a diamond anvil cell by applying hydrostatic pressure, and resonance frequency of longitudinal standing wave in Pt film is measured with picosecond ultrasound at up to 2.4 GPa. Strain dependence of elastic stiffness calculated using acoustoelasticity with elastic stiffness of bulk Pt predicted that the resonance frequency decreases with increasing pressure. However, significant strain dependence of the resonance frequency was not observed. This result indicates that in Pt films strain dependence of elastic stiffness is different from that of the corresponding bulk.
