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用四端引线法测量了4.2K到室温的非晶态(Fe_(1-x)Co_x)_(18)Si_(9.5)B_(12.5)(x=0—1.0)合金的电阻率。结果表明,x=0—1.0的所有样品都出现了电阻率与温度关系的极小值。电阻率极小值温度T_(min)随Co含量x的增加而增加,在x=0.9时出现极大值。在T_(min)温度以下,电阻率与温度关系符合-lnT规律。x=0.5—1.0的样品,电阻率与-lnT关系出现两个斜率。在T_(min)温度以上,约100K以下电阻率符合T~2规律,在约100K以上电阻率则按T~(3/2)规律变化。实验结果表明,约在9.5K和100K温区,电阻率与温度关系可近似表达为:ρ/ρ_(min)=ρ_0+AlnT+BT~2。显现类Kondo型电阻极小。电阻率的T~2关系来源于电子-声子散射。
The resistivity of amorphous (Fe_ (1-x) Co_x) _ (18) Si_ (9.5) B_ (12.5) (x = 0 ~ 1.0) alloys was measured by four- The results show that all samples with x = 0-1.0 exhibit a minimum of resistivity versus temperature. Resistivity minimum temperature T_ (min) increases with the increase of Co content x, with a maximum at x = 0.9. Below the T_ (min) temperature, the resistivity and temperature are in accordance with the -lnT law. Samples with x = 0.5-1.0 show two slopes of resistivity versus -lnT. Above T min, the resistivity below 100 K conforms to the T ~ 2 law, and above about 100 K the resistivity changes according to T ~ (3/2) law. The experimental results show that the relationship between resistivity and temperature can be approximated as ρ / ρ_ (min) = ρ_0 + AlnT + BT ~ 2 at about 9.5K and 100K. Appearance Kondo-type resistance is minimal. The T ~ 2 resistivity is derived from electron-phonon scattering.