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Synthesis and Physical Properties of Arc Melted NiMnSb

Gardelis, S, Androulakis, J, Migiakis, P, Giapintzakis, J, Clowes, S K, Bugoslavsky, Y, Branford, W R, Miyoshi, Y and Cohen, L F (2004) Synthesis and Physical Properties of Arc Melted NiMnSb Journal of Applied Physics, 95 (12). pp. 8063-8068.

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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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Faculty of Engineering and Physical Sciences > Physics
Authors :
Gardelis, S
Androulakis, J
Migiakis, P
Giapintzakis, J
Clowes, S
Bugoslavsky, Y
Branford, W R
Miyoshi, Y
Cohen, L F
Date : 1 January 2004
DOI : 10.1063/1.1739293
Additional Information :

Published in Journal of Applied Physics, Vol. 95, Iss. 12.

Copyright 2004 American Institute of Physics.

Click here to access the journal's website.

Depositing User : Mr Adam Field
Date Deposited : 27 May 2010 14:05
Last Modified : 16 Jan 2019 16:17

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