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We report a ^{59}Co Knight shift measurement in a single crystal of thecobalt oxide superconductor Na_{x}CoO_2\cdot1.3H_2O (T_c=4.25 K). We find thatthe shift due to the spin susceptibility, K^s, is substantially large andanisotropic, with the spin shift along the a-axis K^s_a being two times thatalong the c-axis K^s_c. The shift decreases with decreasing temperature (T)down to T\sim100 K, then becomes a constant until superconductivity sets in.Both K^s_a and K^s_c decrease below T_c. Our results indicate unambiguouslythat the electron pairing in the superconducting state is in the spin singletform.Comment: 4 pages, 5 figure

physical review. b, condensed matter and materials physics

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Spin singlet pairing in the superconducting state ofNaxCoO2∙1.3H2O