Abstract
The effect of substitution of Y atoms for Ca atoms has been studied in the Bi2Sr2Ca1-xYxCu2Oy compound system. For x<0.5, superconductivity is observed and its fractional volume is reduced with increasing x, though the transition temperature of about 85 K is maintained. For x≧0.5 samples, the electrical resistivity behavior can be well described by the three-dimensional variable range hopping conduction, indicating that the system is essentially insulating. In this range of x, magnetic susceptibility shows spin-glass-type cusp at 13 K in the heating process after zero-field cooling and an enhanced cusp at 11 K in the field-cooling process. In the temperature range above about 150 K the Curie-Weiss dependence holds well with a positive paramagnetic Curie temperature, which increases to 40 K with increasing x in the insulating region.
Original language | English |
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Pages (from-to) | 408-412 |
Number of pages | 5 |
Journal | Physica C: Superconductivity and its applications |
Volume | 152 |
Issue number | 5 |
DOIs | |
Publication status | Published - 1988 Jul 1 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering