Logarithmic temperature dependence of electrical resistivity of (Co41Fe39B20) x (Al-O)100-x nanocomposites

被引：5

作者：

Mikhailovskii, Yu. O. ^{[1
]}

Prudnikov, V. N. ^{[1
]}

Ryl'kov, V. V. ^{[2
]}

Chernoglazov, K. Yu. ^{[2
]}

Sitnikov, A. V. ^{[3
]}

Kalinin, Yu. E. ^{[3
]}

Granovskii, A. B. ^{[1
,3
]}

机构：

[1] Moscow MV Lomonosov State Univ, Moscow 119991, Russia

[2] Kurchatov Inst, Natl Res Ctr, Pl Akad Kurchatova 1, Moscow 123098, Russia

[3] Voronezh State Tech Univ, Moskovskii Pr 14, Voronezh 394000, Russia

来源：

PHYSICS OF THE SOLID STATE | 2016年 / 58卷 / 03期

基金：

俄罗斯科学基金会; 俄罗斯基础研究基金会;

关键词：

FILMS;

D O I：

10.1134/S1063783416030227

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The temperature dependence of the electrical conductivity sigma(T) of (Co41Fe39B20) (x) (Al-O)(100-x) of nanocomposite films for different concentrations x of amorphous ferromagnetic metal (56 > x > 30) has been studied in the temperature range of 4.2-300 K. It has been shown that, for concentrations in the interval 56 > x > 49, the conductivity obeys the logarithmic law sigma(T) = A(1 + alpha lnT), where A and alpha depend on the concentration. According to the theory developed by Efetov et al., this logarithmic dependence is connected with specificities of the Coulomb interaction in nanogranulated alloys on the intergranule tunneling in the transient region of concentrations from metallic conduction to the dielectric regime. The comparison of the theory with the experiment has revealed only qualitative agreement. The reasons of the quantitative disagreement have been discussed. The resistivity of samples with the concentrations lying in the range 49 > x > 30 obeys the 1/2 power law.

引用

页码：444 / 446

页数：3

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