Title :
Frequency dependence of ultrasound attenuation in II-type superconductor
Author :
Polzikova, N.I. ; Raevskii, A.O. ; Mansfeld, G.D.
Author_Institution :
Inst. of Radio Eng., Acad. of Sci., Moscow, Russia
Abstract :
It has been theoretically shown that ultrasound attenuation due to magnetic vortices in type II superconductor exhibits local temperature and frequency maxima. The absolute maximum occurs at frequency corresponding to that for thermally activated vortex hopping. It was shown that vortex elasticity gives rise an additional solution of wave equation that significantly manifests itself in the case of strong surface pinning. For different surface pinning conditions the impedances of acoustic resonator were calculated
Keywords :
flux pinning; flux-line lattice; type II superconductors; ultrasonic absorption; II-type superconductor; absolute maximum; acoustic resonator impedances; frequency dependence; magnetic vortices; strong surface pinning; thermally activated vortex hopping; ultrasound attenuation; vortex elasticity; wave equation; Attenuation; Elasticity; Frequency dependence; Magnetoelasticity; Partial differential equations; Superconducting magnets; Surface acoustic waves; Temperature; Type II superconductors; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.765060
