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We report the magnetic susceptibility and NMR studies of a spin-gappedlayered compound  Na2Cu2TeO6 (the spin gap $\Delta\sim$ 250 K), the hole doping effect on theCu2TeO6 plane via a topochemical Na deficiency by soft chemical treatment, andthe static spin vacancy effect by nonmagnetic impurity Zn substitution for Cu.  A finite Knight shift at the $^{125}$Te site was observed for pureNa2Cu2TeO6.  The negative hyperfine coupling constant $^{125}A_{tr}$ is an evidence forthe existence of a superexchange pathway of the Cu-O-Te-O-Cu bond. It turnedout that both the Na deficiency and Zn impurities induce a Curie-type magnetismin the uniform spin susceptibility in an external magnetic field of 1 T, butonly the Zn impurities enhance the low-temperature $^{23}$Na nuclearspin-lattice relaxation rate whereas the Na deficiency suppresses it. A spinglass behavior was observed for the Na-deficient samples but not for theZn-substituted samples. The dynamics of the unpaired moments of the doped holesare different from that of the spin vacancy in the spin-gapped Cu2TeO6 planes.Comment: 4 pages, 7 figures, to be published in J. Phys. Soc. Jpn. Vol. 75,  No. 8 (2006

Hole Doping Effects on Spin-gapped Na2Cu2TeO6 via Topochemical Na Deficiency

Hole Doping Effects on Spin-gapped Na₂Cu₂TeO₆ via Topochemical Na Deficiency