CoFe合金输运系数中的磁振子散射
Magnon scattering in the transport coefficients of CoFe alloys
摘要：
在一组CoFe合金膜上同时测量电阻率$ρ$、热电势${\cal S}$和热导率$κ$。的Co含量的变化$x_\mathrm{Co}$允许通过能带结构的费米能级的系统调谐，和电子和磁性之间的相互作用的研究的传输系数的贡献。虽然$ρ$和$κ$的能带结构和磁振子效应相当弱，但它们在${\cal S}$中非常显著。在纯Fe和纯Co的两种极限情况下，我们追踪了Mott和磁振子阻力对${\cal S}$的贡献的演变。此外，我们还发现了磁振子阻力的一个有趣的符号变化。
英文摘要：
Resistivity $ρ$, thermopower ${\cal S}$, and thermal conductivity $κ$ were measured simultaneously on a set of CoFe alloy films. Variation of the Co-content $x_\mathrm{Co}$ allows for a systematic tuning of the Fermi level through the band structure, and the study of the interplay between electronic and magnetic contributions to the transport coefficients. While band structure and magnon effects in $ρ$ and $κ$ are rather weak, they turn out to be very significant in ${\cal S}$. The evolution of Mott and magnon drag contributions to ${\cal S}$ is traced between the two limiting cases of pure Fe and pure Co. In addition, we find an interesting sign change of the magnon drag.
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