J. Phys. IV France
Volume 09, Numéro PR10, December 1999
International Workshop on Electronic Crystals
Page(s) Pr10-243 - Pr10-246
International Workshop on Electronic Crystals

J. Phys. IV France 09 (1999) Pr10-243-Pr10-246

DOI: 10.1051/jp4:19991061

Magnetic properties of the spin-density wave in (TMTSF)2X and (TMTTF)2Br

N. Matsunaga1, Y. Hosokawa1, H. Iwasaki1, K. Nomura1, S. Takasaki2, J. Yamada2, S. Nakatsuji2, H. Anzai2, T. Nakamura3, T. Takahashi4 and G. Saito5

1  Division of Physics, Hokkaido University, Sapporo 060-0810, Japan
2  Department of Material Science, Himeji Institute of Technology, Kamigohri, Hyogo 678-1297, Japan
3  Institute for Molecular Science, 444-8585, Japan
4  Department of Physics, Gakushuin University, Mejiro 1-5-1, Toshimaku, Tokyo 171-8588, Japan
5  Department of Chemistry, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan

Magnetic properties of the spin density wave (SDW) phase in (TMTSF)2X (X=AsF6, PF6) and (TMTTF)2Br were investigated through analyses of 1H-NMR and static magnetization measurements. A divergent peak was observed, at the temperature T* well below the SDW transition temperature, in the 1H spin-lattice relaxation rate in the incommensurate SDW phase of (TMTSF)2X. A decrease of the differential magnetic susceptibility of (TMTSF)2X with the field parallel to the a-axis was observed around T*. This anomaly indicates a difference of the spin canting above and below T* which divides the SDW phase. In the measurements of magnetic susceptibility on the commensurate SDW phase of (TMTTF)2Br, a large decrease of the spin susceptibility was observed above TSDW and non-activated type behavior in the b'-axis susceptibility is observed below the spin-flop field at low temperature. The data are discussed on the basis of commensurability.

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