DISLOCATION AMPLITUDE DEPENDENT ULTRASOUND ABSORPTION IN NORMAL AND SUPERCONDUCTING LEAD CONTAINING DIVERSE VALENCY IMPURITIES

Abstract

Amplitude degendence of ultrasonic absorption α (ε0) has been studied in lead single crystals containing one of the following impurities : Tl, Sn, Bi, Cd, Sb. Critical amplitude of the beginning of (α dependence on α increased in the going from T1 to Sb in the above impurity series. At s-n transition ε0 increased by 25 to 35%. The characteristic stress level values of dislocation unpinning from impurities were obtained and their change at the superconducting transition was identified. With the aim to define contributions of different physical nature to the total value of interaction between dislocations and impurity atoms an approach for experimental data treatment is offered and the quantitative information of these contributions is obtained. The change of α at n-s transition is explained by the variation of dislocation loops, LN, overdamping degree leading to the increase in internal friction

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Last time updated on 10/04/2020

This paper was published in EDP Sciences OAI-PMH repository (1.2.0).

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