Multiphase oxide superconductors of nominal compositions Tl2BaCa2Cu3Ox have been synthesized and characterized by resistivity and magnetic susceptibility measurements. NMR spin echoes of both thallium isotopes (203Tl and 205Tl) have been detected and the line shifts, the spin-lattice and spin-spin relaxation times have been measured at room temperature for the more abundant 205Tl nuclei. The temperature dependence of the spin-lattice relaxation rate is also reported. The results suggest that, similarly to the behavior of Y in YBa2Cu3O7 oxides, Tl has a small electronic density of states at the Fermi level in the Tl-Ba-Ca-Cu oxide superconductors.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering