We report the magnetic susceptibility and NMR studies of a spin-gapped layered compound Na2Cu2TeO6 (the spin gap Δ∼ 250 K), the hole doping effect on the Cu2TeO6 plane via a topochemical Na deficiency by soft chemical treatment, and the static spin vacancy effect by nonmagnetic impurity Zn substitution for Cu. A finite Knight shift at the 125Te site was observed for pure Na2Cu2TeO6. The negative hyperfine coupling constant 125Atr is an evidence for the existence of a superexchange pathway of the Cu-O-Te-O-Cu bond. It turned out that both the Na deficiency and Zn impurities induce a Curie-type magnetism in the uniform spin susceptibility in an external magnetic field of 1 T, but only the Zn impurities enhance the low-temperature 23Na nuclear spin-lattice relaxation rate whereas the Na deficiency suppresses it. A spin glass behavior was observed for the Na-deficient samples but not for the Zn-substituted samples. The dynamics of the unpaired moments of the doped holes are different from that of the spin vacancy in the spin-gapped Cu2TeO6 planes.
@article{arxiv.cond-mat/0607141,
title = {Hole Doping Effects on Spin-gapped Na2Cu2TeO6 via Topochemical Na Deficiency},
author = {K. Morimoto and Y. Itoh and K. Yoshimura and M. Kato and K. Hirota},
journal= {arXiv preprint arXiv:cond-mat/0607141},
year = {2016}
}
Comments
4 pages, 7 figures, to be published in J. Phys. Soc. Jpn. Vol. 75, No. 8 (2006)