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arXiv 0810.0123cond-mat.mtrl-sci
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富铁Fe-Cr合金德拜温度的反常行为

Anomalous behavior of the Debye temperature in Fe-rich Fe-Cr alloys

B. F. O. Costa, J. Cieslak, S. M. Dubiel

摘要:

根据60 - 300 K温度范围内穆斯堡尔谱中心位移随温度的变化关系,确定了富Fe Fe $_{100-x}$ Cr $_x$与$0\le x \le 22.3$无序合金的德拜温度$Θ_D$。其成分依赖性在$x \approx 5$处显示出最大值,与纯铁相比,相对增加了$\sim 30$ %。产生这种效应的成分与其它几个量,如:G.居里温度和自旋波刚度系数$D_0$显示出它们的最大值,但是$Θ_D$的增强显著更大,并且与所研究系统中的超精细场(巡游$s$类电子的自旋密度)的增强相当。结果表明,电子-声子相互作用在该合金体系中是重要的。

英文摘要:

Debye temperature, $Θ_D$, of Fe-rich Fe$_{100-x}$Cr$_x$ disordered alloys with $0\le x \le 22.3$ was determined from the temperature dependence of the central shift of Mössbauer spectra recorded in the temperature range of 60 -- 300 K. Its compositional dependence shows a maximum at $x \approx 5$ with a relative increase of $\sim 30$% compared to a pure iron. The composition at which the effect occurs correlates well with that at which several other quantities, e. g. the Curie temperature and the spin-wave stiffness coefficient, $D_0$, show their maxima, but the enhancement of $Θ_D$ is significantly greater and comparable with the enhancement of the hyperfine field (spin-density of itinerant $s$-like electrons) in the studied system. The results suggest that the electron-phonon interaction is important in this alloy system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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