Electrical properties of approximant phases in Al–Pd–(Fe, Ru) systems
Electrical properties of approximant phases in Al–Pd–(Fe, Ru) systems
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Al-Pd-(Fe, Ru) 体系中近似相的电学性质
DOI：
10.1016/s0921-5093(00)01119-9
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发表时间：
2000
期刊：
影响因子：
6.4
通讯作者：
S. Takeuchi
中科院分区：
文献类型：
--
作者：
R. Tamura;K. Komatsu;T. Asao;S. Takeuchi
给出了Al-Pd-(Fe，Ru)三元系中结构有序的1/0立方相的X射线衍射图。Al-Pd-Fe系统的1/0近似晶格具有体心晶格，a=15.3Å，而Al-Pd-Ru系统的1/0近似晶格为面心晶格，a=15.5Å，并与文献报道的结构模型进行了比较。对它们的电阻率进行了研究，发现它们在最低阶的近似物：ρ300K∼1000μΩcm处具有相当高的电阻率。此外，在ρ-T曲线上还观察到了伴随着明显的电阻率极大值的负温度系数。特殊的ρ-T依赖关系将被描述为具有强自旋轨道散射的量子干涉效应，并将表明1/0近似的输运性质对无序非常敏感，反映了它们结构的灵活性。
X-ray diffraction patterns of structurally ordered 1/0 cubic approximant phases in the Al–Pd–(Fe, Ru) ternary systems are presented. The 1/0 approximant in the Al–Pd–Fe system was found to possess a body-centered lattice with a=15.3 A ̊ , whereas that in the Al–Pd–Ru system a face-centered one with a=15.5 A ̊ , and the results were compared with the reported structural models. Their electrical resistivities have been investigated and found to be substantially high for the lowest order approximants: ρ300K∼1000 μ Ω cm . In addition, negative temperature coefficients accompanied by a distinctive resistivity maximum in the ρ–T curves have been observed. The peculiar ρ–T dependences will be described in terms of the quantum interference effects with strong spin–orbit scattering and it will be shown that the transport properties of 1/0 approximants are quite sensitive to disorder reflecting the flexibility of their structure.