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Spin Density Wave in Quasi‐One‐Dimensional Organic Conductors
Author(s) -
Nomura K.,
Matsunaga N.,
Ishikawa A.,
Kotani H.,
Yamashita K.,
Sasaki T.,
Hanajiri T.,
Yamada J.,
Nakatsuji S.,
Anzai H.,
Nakamura T.,
Takahashi T.,
Saito G.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200101)223:2<449::aid-pssb449>3.0.co;2-a
Subject(s) - condensed matter physics , spin density wave , fermi surface , phase transition , phase (matter) , chemistry , spin (aerodynamics) , magnetic field , field (mathematics) , physics , thermodynamics , antiferromagnetism , quantum mechanics , superconductivity , mathematics , organic chemistry , pure mathematics
The incommensurate spin density wave (SDW) phases in (TMTSF) 2 PF 6 and (TMTTF) 2 Br were investigated by transport measurements under pressure and in magnetic field parallel to the c *‐axis. For the SDW phase of (TMTSF) 2 PF 6 slightly suppressed by the pressure, the SDW transition temperature T SDW increases with the applied magnetic field. The field dependence of T SDW is described by a quadratic behavior and the coefficient of the quadratic term increases with increasing pressure. For the incommensurate SDW phase of (TMTTF) 2 Br stabilized under the pressure above 0.5 GPa, the SDW transition shows similar behavior as in the case of (TMTSF) 2 PF 6 with increasing magnetic field. These results are consistent with the prediction of the mean field theory based on the nesting of the Fermi surface. The incommensurate SDW phases in both (TMTSF) 2 PF 6 and (TMTTF) 2 Br are understood in a common pressure axis with taking the reduction of the coupling constant by the pressure into account.