Spin-density-wave transition of (TMTSF)2 PF6 at high magnetic fields
Spin-density-wave transition of (TMTSF)2 PF6 at high magnetic fields
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高磁场下 (TMTSF)2 PF6 的自旋密度波跃迁
DOI：
10.1103/physrevb.64.052405
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发表时间：
2001
影响因子：
3.7
通讯作者：
H. Anzai
中科院分区：
文献类型：
--
作者：
N. Matsunaga;K. Yamashita;H. Kotani;K. Nomura;T. Sasaki;T. Hanajiri;J. Yamada;S. Nakatsuji;H. Anzai
测量了Bechgaard盐(TMTSF)$2$pF$6$在不同压力下的横向磁阻，其磁场高达24T，平行于最低电导率方向c<sup>0</sup>。自旋密度波(SDW)相变温度T{rm{SDW}}与磁场呈二次关系。随着压力的增加，T{rm{sdw}}$减小，二次项系数增大。这些结果与基于准一维费米面嵌套的平均场理论的预测是一致的。利用平均场理论，得到理想嵌套情况下的{T\rM{sdw}}$约为16K，这意味着即使在12K的环境压力下，(TMTSF)$2$pF$6$的sdw相基本上被系统的二维性所抑制。
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.