Abstract
We studied the 2D NMR spectrum on the novel superconductor Na 0.35 CoO 2 · 1.3 H 2 O . The temperature dependence of Knight shift at 2D in the normal state is parallel to that of magnetic susceptibility and the hyperfine coupling constant is estimated as 0.16 kOe / μ B . The resonance frequency in the low temperatures does not change below T c , which is contrast to that in 59Co site.
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