Abstract

The heat capacity (C_P), magnetocaloric effect (∆T and ∆S_M), thermal diffusivity η(T), and electrical resistivity ρ(T) of the LaFe_11.1Mn_0.1Co_0.7Si_1.1 alloy are studied in the temperature range of 80–300 K in magnetic fields of up to 8 T. Entropy change ∆S_M in a magnetic field of 1.8 T is found equal to 4.6 J/(kg K). An anomaly that consists of a sharp decrease in the electrical resistivity in a narrow temperature range and subsequent restoration of its metallic behavior is observed in the curve of temperature dependence ρ(T) near Curie temperature T_C. In the vicinity of T_C, the following direct relationship between ∆T and resistivity change ∆ρ is found in a magnetic field of 1.8 T: ∆T(T) = α∆ρ(T). The η(T) dependence shows a pronounced minimum near T_C, which indicates strong scattering of heat carriers on fluctuations of the magnetic order parameter and, possibly, on the crystal lattice distortions.

中文翻译：

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LaFe11.1Mn0.1Co0.7Si1.1合金的热物理和磁热性能

摘要

在该温度范围内研究了LaFe _11.1 Mn _0.1 Co _0.7 Si _1.1合金的热容量( C _P )、磁热效应(Δ T和Δ S _M )、热扩散率η( T )和电阻率ρ( T )在高达 8 T 的磁场中为 80–300 K。发现 1.8 T 磁场中的熵变化 ΔSM等于4.6 J/(kg K) _。在温度依赖性曲线 ρ( T) 接近居里温度T _C。在T _C附近，在 1.8 T 的磁场中， Δ T与电阻率变化 Δρ之间存在以下直接关系： Δ T ( T ) = αΔρ( T )。η( T ) 依赖性在T _C附近显示出明显的最小值，这表明热载体对磁序参数的波动以及可能对晶格畸变的强烈散射。