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VOLUME 59 (1994) | ISSUE 5 | PAGE 334
Determination of the gap in Bi-Sr-Ca-Cu-O (2:2:1:2-phase) superconducting whiskers by tunneling spectroscopy
The current-voltage characteristics of break junctions in Bi-Sr-Ca-Cu-O whiskers (the 2:2:1:2 phase), with a transition temperature 60 <ГС<81 К, have been studied experimentally. These /^characteristics have a gap structure which is easily reproducible. From it one can determine the gap parameter Δ fairly accurately. In the interval of transition temperatures Tc studied, the ratio 2A(0)/kTc for the Bi-Sr-Ca-Cu-O (2:2:1:2) whiskers is 7.1 ±0.2. The temperature dependence of the gap, Δ(Γ), agrees satisfactorily with the formal BCS theory.