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Effect of low-level Ge additions on the superconducting transition in PbTe:Tl

Authors:	S A Nemov M K Zhitinskaya R V Parfen’ev D V Shamshur

Institution:	(1) St. Petersburg State Technical University, 195251 St. Petersburg, Russia;(2) A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia

Abstract:	A study is reported of the effect of low-level germanium additions (∼0.01–0.1 at. %) on the parameters of the superconducting transition, viz. the critical temperature T _c, the second critical magnetic field H _c2, and $\left\| {{{dH_{c2} } \mathord{\left/ {\vphantom {{dH_{c2} } {dT}}} \right. \kern-\nulldelimiterspace} {dT}}} \right\|_{T \to T_c }$ in PbTe doped with 2 at. % Tl, which are derived from the dependence of the electrical resistivity of a sample on temperature (0.4–4.2 K) and magnetic field (0–1.3 T). The discontinuity revealed by experimental data is related to the onset of a Ge-induced structural phase transition. Fiz. Tverd. Tela (St. Petersburg) 40, 1204–1205 (July 1998)

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