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NMR study of Na3− xRu4O9

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
63
Identifiers
DOI: 10.1016/s0022-3697(02)00129-4
Keywords
  • A. Oxides
  • D. Nuclear Magnetic Resonance (Nmr)
  • D. Phase Transitions
  • D. Electrical Properties
  • D. Magnetic Properties

Abstract

Abstract Low-dimensional conductor Na 3− x Ru 4O 9 has been studied by means of 23Na nuclear magnetic resonance measurement in order to clarify the electronic state of this compound. The magnetic susceptibility χ is almost constant from 100 to 300 K, then increases with temperature, and shows a kink at 584 K. The temperature dependence of the Knight shift K is almost in proportion to χ. From the result of the temperature dependence of spin–lattice relaxation time, it has been found that this compound has an energy gap, Δ, which is closely correlated with the gap-like behavior of χ. Consequently, we consider that there exists a spin-singlet state in all or a part of RuO 6 chains in Na 3− x Ru 4O 9.

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