Anomalies in the Electrical Resistivity of Tl-Sr-V-O System : Search for Superconductivity

概要

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High temperature oxide superconductors without copper are of interest from the view point of understanding the mechanism of superconductivity in oxide systems. Consequent to a report by Matsuda et al.^<:1)> of observation of superconductivity at 30 K and metastable superconductiity at 130 K in Tl-Sr-V-O system, we have synthesized several strontium vanadates of the nominal composition M_nSrVO_x with M=Tl, Bi, Pb, Y and K (n=0.2 to 1.0 for Tl and 0.25 for the rest), and studied their resistivity behaviour. Samples were prepared following the recipe given by Matsuda et al. We have not been able to observe superconductivity in any of these systems between the temperature range of 12 to 300 K. However, some resistivity anomalies are observed in Tl containing vanadates synthesized underdifferent heat treatment schedules.
社団法人応用物理学会の論文
1991-04-01