We report magnetization studies on single crystals of Tl2Ba2Cu1O6 superconductors. For magnetic field parallel to the c-axis configuration, low-field magnetization measurements show Hc1=0 at Ts=86.5 K while the mean-field transition temperature Tc0=88.8 K. The transition width in zero-field-cooled magnetization increases linearly with field, but with a finite intercept at H=0, consistent with the Hc1=0 measurements. The experimental results strongly suggest the Tl-compound is Josephson coupled between superconducting layers, and our results provide direct evidence of the spontaneous excitations of flux lines in this system.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering