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

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

Strongly Correlated Electrons 2009-11-10 v1 Superconductivity

Authors: F. L. Ning , T. Imai , B. W. Statt , F. C. Chou

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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.

Keywords

spin dynamics triangular lattice NMR Fermi liquid cobaltates

Cite

@article{arxiv.cond-mat/0408521,
  title  = {Spin-Dynamics in the Carrier-Doped $S=1/2$ Triangular-Lattice of Na$_{x}$CoO$_{2}$-yH$_{2}$O},
  author = {F. L. Ning and T. Imai and B. W. Statt and F. C. Chou},
  journal= {arXiv preprint arXiv:cond-mat/0408521},
  year   = {2009}
}

Comments

4 figures. Submitted to PRL on May 13, 2004

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