Temperature dependence of the resistivity in amorphous ferromagnetic alloys: Spin-wave contribution and resistivity minimum
Temperature dependence of the resistivity in amorphous ferromagnetic alloys: Spin-wave contribution and resistivity minimum
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DOI：
10.1103/physrevb.17.1355
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发表时间：
1978-02
影响因子：
3.7
通讯作者：
G. Bergmann;P. Marquardt
中科院分区：
文献类型：
--
作者：
G. Bergmann;P. Marquardt
${\mathrm{Ni}}_{c}{\mathrm{Au}}_{1\ensuremath{-}c}$、${\mathrm{Co}}_{c}{\mathrm{Au}}_{1\ensuremath{-}c}$ 和非晶态铁磁合金的电阻率${\mathrm{Fe}}_{c}{\mathrm{Au}}_{1\ensuremath{-}c}$ 作为温度的函数进行测量。非晶态合金是纯金属的，通过淬火冷凝获得。电阻率显示出 ${T}^{2}$ 温度依赖性，这是由于电子-磁振子相互作用所致。从理论角度来看，非晶金属电阻率的温度依赖性提供了一个有趣的问题，因为传导电子的寿命比磁振子和声子的振荡周期短得多。因此，弹性和非弹性散射过程不能独立处理，Ziman-Baym 公式失效。只有在富铁 ${\mathrm{Fe}}_{c}{\mathrm{Au}}_{1\ensuremath{-}c}$ 合金 ($cg0.9$) 中，我们发现低温电阻率急剧增加，这一点已被其他人在金属玻璃中观察到。这种行为与该浓度区域中 Fe 原子磁矩的突然下降有关。
The resistivities in amorphous ferromagnetic alloys of ${\mathrm{Ni}}_{c}{\mathrm{Au}}_{1\ensuremath{-}c}$,${\mathrm{Co}}_{c}{\mathrm{Au}}_{1\ensuremath{-}c}$ and ${\mathrm{Fe}}_{c}{\mathrm{Au}}_{1\ensuremath{-}c}$ are measured as a function of temperature. The amorphous alloys are purely metallic and obtained by quenched condensation. The resistivity shows a ${T}^{2}$ temperature dependence which is due to electron-magnon interaction. From a theroretical point of view, the temperature dependence of the resistivity in amorphous metals provides an interesting problem because the lifetime of the conduction electrons is much shorter than the oscillation period of the magnons and phonons. Therefore, the elastic and inelastic scattering processes cannot be treated independently and the Ziman-Baym formula fails. Only exceptionally in Fe-rich ${\mathrm{Fe}}_{c}{\mathrm{Au}}_{1\ensuremath{-}c}$ alloys ($cg0.9$) we found the strong increase of the resistivity towards low temperature which has been observed by others in metallic glasses. This behavior is correlated with the sudden drop of the magnetic moment of the Fe atoms in this concentration region.