^<13>C-NMR study of the exotic superconducting state in TMTSF salt using single site enriched molecule.

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(TMTCF)_2X, X=S,Se family is a quasi-one-dimensional conductor and well investigated from the aspect of its low dimensional transport properties and superconductivity. Recently the high upper critical field that exceed the Pauli limit and triplet superconductivity were suggested. ^<13>C-NMR is one of powerful tools to clarify such exotic electronic properties from a microscopic viewpoint. However, there is a problem caused by dipole-dipole interaction between ^<13>C nuclei on conventional double side substitution to the central C=C. Then, the new synthesis route of double side substitution to the central C=C is desired. We developed the new route of the single side substitution and determined the hyperfine coupling tensor of (TMTSF)_2X salt.We found the spatial inhomogeneity of commensurate SDW structure as the sub phase of the incommensurate SDW phase from ^<13>C-NMR spectrum in (TMTSF)_2PF_6. We also revealed the connection between the SDW fluctuation and the non-Fermi liquid behavior just above the superconductive transition temperature observed on the transport measurements.