Spin-density-wave transition of (TMTSF)$_2$PF$_6$ at high magnetic fields

Details Spin-density-wave transition of (TMTSF)$_2$PF$_6$ at high magnetic fields Spin-density-wave transition of (TMTSF)$_2$PF$_6$ at high magnetic fields

2001-05-17

arxiv.org/abs/cond-mat/0105336v1

Phys. Rev. B 64, 052405 (2001) (4 pages)

Physics

Condensed Matter

Strongly Correlated Electrons

11pages,6figures(EPS), accepted for publication in PRB

Scientific paper

10.1103/PhysRevB.64.052405

The transverse magnetoresistance of the Bechgaard salt (TMTSF)$_2$PF$_6$ has been measured for various pressures, with the field up to 24 T parallel to the lowest conductivity direction c$^{\ast}$. A quadratic behavior is observed in the magnetic field dependence of the spin-density-wave (SDW) transition temperature $T_{\rm {SDW}}$. With increasing pressure, $T_{\rm {SDW}}$ decreases and the coefficient of the quadratic term increases. These results are consistent with the prediction of the mean-field theory based on the nesting of the quasi one-dimensional Fermi surface. Using a mean field theory, $T_{\rm {SDW}}$ for the perfect nesting case is estimated as about 16 K. This means that even at ambient pressure where $T_{\rm {SDW}}$ is 12 K, the SDW phase of (TMTSF)$_2$PF$_6$ is substantially suppressed by the two-dimensionality of the system.

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