Ultrasound and Vortex Oscillations in High-Temperature Superconductors

被引:2
作者
Apushkinskii, E. G. [1 ]
Astrov, M. S. [2 ]
Sobolevskii, V. K. [1 ]
机构
[1] St Petersburg State Polytech Univ, St Petersburg 195251, Russia
[2] Efremov Res Inst Electrophys Apparat, St Petersburg 196641, Russia
关键词
HIGH-TC SUPERCONDUCTORS; DYNAMIC POLARIZATION ECHOES; C SUPERCONDUCTORS; MIXED-STATE; LATTICE; GENERATION; POWDERS; WAVES;
D O I
10.1134/S1063784211060028
中图分类号
O59 [应用物理学];
学科分类号
摘要
An HTSC powder sample with grain (particle) diameter of 20-50 mu m placed in a dc magnetic field B(0) and cooled to a temperature below the superconducting transition temperature was exposed to the radio-frequency (rf) pulsed magnetic field B(similar to) (B(similar to) perpendicular to B(0)) at a carrier frequency of 30.7 MHz. Stable echo signals were recorded which followed different rf-pulse trains. This phenomenon has the following mechanism. The rf magnetic field stimulates fluxoid oscillations on the HTSC grain surface, which are transformed into lattice oscillations through the pinning centers and induce a propagating sound wave. The second-order nonlinearity with respect to the gradient of the crystal lattice deviation from the equilibrium position taken into account in the sound wave equation yields the dependence of the crystal lattice natural frequency on the amplitude and length of the pulses which excite these oscillations. This dependence is responsible for the emergence of echo signals.
引用
收藏
页码:788 / 796
页数:9
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