| Abstract: | A theory of polarization echo in powdered type-II superocnductors is presented, which takes into consideration mechanisms of nonlinear excitation, nonlinear damping, and nonlinear dispersion in interaction of radio frequency pulses with twinning boundary dislocations. It is shown that the motion of defects and magnetization jumps associated with it take place with retention of phase information, which is the basis of the long-lived echo. The short-lived dynamic echo and the long-lived static echo are explained and their properties are investigated. The connection of polarization echo with other phenomena due to the defect structure of the material is established.Kazan Physicotechnical Institute, KNTs RAN. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 20–48, July, 1993. |
