63Cu NMR measuements have been carried out in heavily-doped TlSr2CaCu2O7-δ with Tc = 70K, 52K and OK, respectively, and in lightly-doped TlSr2(Lu0.7Ca0.3)Cu2Oy with Tc = 40K under a magnetic field of 11T. From a systematic measurement of the nuclear-spin lattice relaxation rate, 63(1/T1), the antiferromagnetic (AF) spin correlation is suppressed with increasing hole content, i.e. with decreasing Tc as in the case of Tl2Ba2CuO6+y. From the Knight shift measurement, it has been found that the T-independent behavior of the spin susceptibility above Tc in heavily-doped system changes into a T-decreasing one in the lightly-doped TlSr2(Lu0.7Ca0.3)Cu2Oy, which is the same as in YBa2Cu3O6.63.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering