Anisotropy of Ultrasonic Attenuation in Pure Syngle Crystal of Niobium

概要

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Anisotropies of longitudinal and transverse ultrasonic attenuations in a pure single crystal of niobium were measured near Hc_2 at temperatures above 4.2K. Separation of the anisotropy due to the excitation spectrum of quasiparticles from the crystallographic anisotropy (Hc_2-anisotropy) was made and the Hc_2-anisotropy measured by using 70MHz longitudinal waves was found in qualitative agreement with theory regarding its angular and temperature dependences. The experimental data of the anisotropies of the longitudinal wave attenuations at 70MHz agree qualitatively with both the theories of Maki-Kinder and Houghton-Maki at a lower temperature (T/T_0≡t=0.70) whereas at a higher temperature (t=0.89) they do not resemble any of two theories. The anisotropies of the transverse wave attenuations deffer from any of these two theories especially at higher temperature.
社団法人日本物理学会の論文
1974-09-15