The Robert W. Reneker Professor of Industrial Chemistry
Department of Materials and Interfaces
Weizmann Institute of Science
Rehovot 76100, Israel
High Temperature Superconductivity
Our main area of research is material science of high temperature ceramic superconductors. Since the discovery in 1986 of superconductivity in ceramic cuprates, there is a major effort to give these materials desirable physical and mechanical properties to make them useful candidates for application in micro-electonics as magnetic sensors, superconducting tapes and wires, frictionless bearings and magnetic suspension devices. We have focused on two topics:
- Preparation of mercury cuprates films by a novel sol-gel method developed in our group. These films exhibit currently the highest critical transition temperature to the superconducting state, 134° K.
- Preparation of bulk YBa2Cu3O7-d melt-textured superconductors using a fast melt fast quench process in a solar furnace. The product exhibits high critical current density
~104 Amp/cm2 at liquid nitrogen temperature and in a field of a few Tesla. This performance is achieved by inclusion of microscopic normal particles, which serve as effective pinning centers for the magnetic flux, in the superconducting melt-textured matrix.
The Meissner effect: magnetic disk floating above
a ceramic superconductor cooled to liquid nitrogen temperature
- Structural and Magnetic Properties of Silver Doped Melt-Textured YBCO Prepared in a Solar Furnace
T.Godin and S.Reich
Applied Superconductivity (1998).
- Growth Mode of HgBa2Ca2Cu3O8+dS.C. Films Prepared by a Sol-Gel Method on Y0.15Zr0.85O1.93 Substrates
S.Reich and Y.Tsabba
Advanced Materials 9, 329 (1997).