2004/12/31 by Yoshiaki Kobayashi, Hidekazu Watanabe, Mai Yokoi +3 · 1 citation
Chemistry · Physics and Astronomy · #Advanced Condensed Matter Physics #Advanced NMR Techniques and Applications #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1143/jpsj.74.1800
published as J. Phys. Soc. Jpn. 74 (2005) No.6 1800. · 8 pages, 6 figures, J.Phys. Soc. Jpn 74 (2005) No.6
arxiv created 2005/03/21 · openalex publication_date 2005/06/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Temperature (T) dependence of 59Co-NMR Knight shifts K of Na0.3CoO2.1.3H2O has been studied, where samples of randomly oriented powder and aligned crystals have been used for the applied magnetic fields H // ab plane and H //c-axis, respectively. For both directions of H, the shift K decreases below the superconducting transition temperature Tc(H) with decreasing T, indicating that the superconducting electron pairs are in the singlet state. The upper critical fields Hc2(T) determined from the K(H)-T curves are found to be consistent with the values reported by the resistivity measurements for both directions of H.