Spin-Dynamics in the Carrier-Doped $S=1/2$ Triangular-Lattice of Na$_{x}$CoO$_{2}$-yH$_{2}$O

F. L. Ning; T. Imai; B. W. Statt; F. C. Chou

doi:10.1103/PhysRevLett.93.237201

paper

Spin-Dynamics in the Carrier-Doped $S = 1/2$ Triangular-Lattice of Na $_{x}$ CoO $_{2}$ -yH $_{2}$ O

arXiv:cond-mat/0408521 · doi:10.1103/PhysRevLett.93.237201

Abstract

We probed the local electronic properties of the mixed-valent Co(+4-x) triangular-lattice in Na{x}CoO{2}-yH{2}O by 59-Co NMR. We observed two distinct types of Co sites for x>=1/2, but the valence seems averaged out for x~1/3. Local spin fluctuations exhibit qualitatively the same trend down to ~100 K regardless of the carrier-concentration x, and hence the nature of the electronic ground state. A canonical Fermi-liquid behavior emerges below ~100 K only for x~1/3.

4 figures. Submitted to PRL on May 13, 2004

Spin-Dynamics in the Carrier-Doped S=1/2 Triangular-Lattice of Nax​CoO2​-yH2​O

Abstract

Spin-Dynamics in the Carrier-Doped $S = 1/2$ Triangular-Lattice of Na $_{x}$ CoO $_{2}$ -yH $_{2}$ O