Recent Advances in Ultrasonic Measurements under Multi-Extreme Conditions

Abstract

In this article, we review recent advances in ultrasonic measurements under multi-extreme conditions such as high pressures, high magnetic fields and low temperatures. We have developed a clamped piston-cylinder high-pressure cell for the application of hydrostatic pressure and uniaxial one as well, and succeeded to perform the ultrasonic measurement under multi-extreme conditions, even in a pulsed magnetic field for the first time. We show the technical details, the current problems and some of recent results obtained in compounds with a ThCr₂Si₂-type crystal structure such as EuRh₂Si₂ and BaFe₂As₂.