Superconductivity on Single Crystals of Tl-Ca-Ba-Cu-O System
The investigation on the growth of single crystals of the Tl-Ca-Ba-Cu-0 superconducting system was carried out using the flux growth method. The crystal structure and superconducting properties of mm-sized single crystals were measured using X-ray diffraction and the SQUID magnetometer. The grown crystals are typically in platelet form ; 0.5 to 2.5 mm wide and about 0.2 mm thick. The crystals exhibit a mirror-like surface and some growth steps can be observed through a scanning electron microscope. The superconducting onset transition temperature of 108K to 118K was determined by DC magnetic susceptibility obtained for as-grown single crystals. The transition temperature has a tendency to increase as the amount of CaO-CuO in the starting nominal composition rises. According to the X-ray diffraction measurement, the c-axis of the grown crystals is 35.8Å for those with Tc of 118K, and 29.3Å for those with Tc of 108K.
KeywordsSuperconducting Transition Temperature Grown Crystal Squid Magnetometer Platelet Form Intergrowth Structure
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- 2.H. Takei, H. Takeya, Y. Iye, T. Tamegai and F. Sakai, Jpn. J. Appl. Phys. 27, Suppl. 2, 51 (1988).Google Scholar
- 3.L. F. Schneemeyer, R. B. van Dover, S. H. Glarum, S. A. Sunshine, R. M. Fleming, B. Batlogg, T. Siegrist, J. H. Marshall, J. V. Waszczak and L. W. Rupp, Nature 332, 31 March (1988).Google Scholar
- 4.B. Morosin, D. S. Ginley, P. F. Hlava, M. J. Carr, R. J. Baughman, J. E. Schirber, E. L. Venturini and J. F. Kwak (preprint).Google Scholar
- 5.C. C. Torardi, M. A. Subramanian, J. C. Calabrese, J. Gopalakrishnan, K. J. Morrissey, T. R. Askew, R. B. Flippen, U. Chowdhry and A. W. Sleight, Science 240, 631 April (1988).Google Scholar