Synthesis and physical properties of arc melted NiMnSb
Synthesis and physical properties of arc melted NiMnSb
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DOI：
10.1063/1.1739293
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发表时间：
2004-06
影响因子：
3.2
通讯作者：
S. Gardelis;J. Androulakis;P. Migiakis;J. Giapintzakis;S. Clowes;Y. Bugoslavsky;W. Branford;Y. Miyoshi;L. Cohen
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文献类型：
--
作者：
S. Gardelis;J. Androulakis;P. Migiakis;J. Giapintzakis;S. Clowes;Y. Bugoslavsky;W. Branford;Y. Miyoshi;L. Cohen
几个多晶样品的半Heusler合金NiMnSb生长电弧熔炼的化学计量和非化学计量的量的高纯度的组成元素。通过粉末X射线衍射对所制备样品的结构和相纯度进行了系统的研究。通过测量电阻率、热导率和热电势研究了饱和磁化强度M-s（5 K）=4 mu（B）/公式单位的最佳样品的输运性质。磁性和输运数据的特征与NiMnSb在低温下处于半金属状态一致，即，传导电子完全自旋极化。然而，在4.2K下对同一样品的点接触Andreev反射测量表明仅类似于45%的自旋极化。
Several polycrystalline samples of the half-Heusler alloy NiMnSb were grown by arc melting of stoichiometric and nonstoichiometric amounts of high-purity constituent elements. The structure and the phase-purity of the prepared samples were examined systematically by powder x-ray diffraction. The transport properties of the best sample, with saturation magnetization M-s(5 K)=4 mu(B)/formula unit, were studied by measuring electrical resistivity, thermal conductivity, and thermopower. Features in both magnetic and transport data are consistent with NiMnSb being in a half-metallic state at low temperatures, i.e., the conduction electrons are fully spin polarized. However, point-contact Andreev reflection measurements on the same sample at 4.2 K demonstrate only similar to45% spin polarization.