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

（TMTCF）_2X， X=S，Se族是准一维导体，从其低维输运性质和超导性方面进行了研究。最近提出了超过泡利极限的高上临界场和三重态超导。C-NMR是从微观角度阐明这种奇异电子性质的有力工具之一。然而，在常规的双侧取代到中心C=C时，存在^<13>C核之间的偶极-偶极相互作用引起的问题。然后，提出了双侧取代到中心C=C的新合成路线。我们开发了单侧取代的新途径，并测定了（TMTSF）_2X盐的超精细耦合张量。我们从（TMTSF）_2PF_6的^<13>C-NMR谱中发现了相应SDW结构在空间上的不均匀性，这是相应SDW相的子相。我们还揭示了SDW波动与非费米液体行为之间的联系，而非费米液体行为恰好高于输运测量中观察到的超导转变温度。

(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.