Details

Autor(en) / Beteiligte

• Gardelis, S.
• Androulakis, J.
• Migiakis, P.
• Giapintzakis, J.
• Clowes, S. K.
• Bugoslavsky, Y.
• Branford, W. R.
• Miyoshi, Y.
• Cohen, L. F.

Titel

Synthesis and physical properties of arc melted NiMnSb

Ist Teil von

• Journal of applied physics, 2004-06, Vol.95 (12), p.8063-8068

Erscheinungsjahr

2004

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• 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 Ms(5 K)=4 μB/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 ∼45% spin polarization.