BULK SUPERCONDUCTIVITY OF THE (TL0.5BI0.5)(CA1-XYX)SR2CU2OY SYSTEM
Journal
Japanese Journal of Applied Physics Part 2-Letters
Journal Volume
28
Journal Issue
9
Pages
L1514-L1517
Date Issued
1989
Author(s)
Abstract
A family of (Tl 0.5 Bi 0.5 )(Ca 1- x Y x )Sr 2 Cu 2 O y compounds with x =0, 0.1, 0.2, 0.3, 0.5 and 0.7 were studied systematically. The major phase (above 90%) of all sintered samples was identified as (Tl, Pb)CaSr 2 Cu 2 O y , an isostructure of the 1122 phase. A maximum T c zero up to 102 K was achieved at x =0.2, and semiconducting behavior was found at x =0.7. The magnetization measurement is consistent with the resistance data observed. The c -axis of a unit cell contracted significantly and monotonically as the Y substitution increased. It appears that the reduction of the interlayer distance as well as the excess positive charge introduced by substitution played an important role on superconductivity; the difference from a similar Y-substituted Bi 2 (Ca 1- x Y x )Sr 2 Cu 2 O y system was discussed.
Type
journal article