SPIN SUSCEPTIBILITY OF UNEQUIVALENT CUO2 LAYERS IN TL2BA2CA2CU3O10-DELTA WITH DIFFERENT T-C

The (CU)-C-63 and O-17 NMR shift measurements in normal and supercondu cting states of Tl2Ba2Ca2Cu3O10-5 (TL2223) with various delta are repo rted. In the overdoped sample of Tl2223 with T-c<T-c(opt) and delta<de lta(opt) the different temperature dependencies of the Knight shift K- 63,K-17 are revealed for nonequivalent CuO2 layers. A more gradual dec rease of the shift with temperature takes place for inner CuO2 layer w ith the square oxygen coordination for Cu. In going towards the underd oped Tl2223 with T-c=104K and delta>delta(opt) the changes of K-63,K-1 7 with temperature are found to be the same in different layers. Varia tions with doping of the valence contribution to electric field gradie nt at the Cu site are discussed to estimate the concentration of holes in different CuO2 layers.