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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Low temperature heat capacity of Fe_(1-x)Ga_x alloys with large magnetostriction
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Low temperature heat capacity of Fe_(1-x)Ga_x alloys with large magnetostriction

机译：磁致伸缩大的Fe_（1-x）Ga_x合金的低温热容

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摘要

The low temperature heat capacity C_p of Fe_(1-x)Ga_x alloys with large magnetostriction has been investigated. The data were analyzed in the standard way using electron (γT) and phonon (βT~3) contributions. The Debye temperature Θ_D decreases approximately linearly with increasing Ga concentration, consistent with previous resonant ultrasound measurements and measured phonon dispersion curves. Calculations of Θ_D from lattice dynamical models and from measured elastic constants C_(11), C_(12), and C_(44) are in agreement with the measured data. The linear coefficient of electronic specific heat γ remains relatively constant as the Ga concentration increases, despite the fact that the magnetoelastic coupling increases. Band structure calculations show that this is due to the compensation of majority and minority spin states at the Fermi level.
机译：研究了磁致伸缩大的Fe_（1-x）Ga_x合金的低温热容C_p。使用电子（γT）和声子（βT〜3）的贡献以标准方式分析数据。德拜温度Θ_D随着Ga浓度的增加大致呈线性下降，这与先前的共振超声测量结果和测得的声子色散曲线一致。根据晶格动力学模型和测得的弹性常数C_（11），C_（12）和C_（44）计算Θ_D与测得的数据一致。尽管磁弹性耦合增加，但随着Ga浓度的增加，电子比热γ的线性系数保持相对恒定。能带结构计算表明，这是由于费米能级补偿了多数自旋态和少数自旋态。

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