Transport and magnetic properties of PtMnSb and related heusler alloys.

In this thesis the results of the research on the properties of the XMnZ-type Heusler alloys are discussed. The reason for the recent interest in these materials was the discovery of the very large magneto-optical kerr effect at room temperature of PtMnSb, and the very strong spin polarization of the p-type valence band in the Heusler alloys. According to the energy band calculations, in case of NiMnSb and PtMnSb, this polarization is even complete, i.e. at the Fermi level only electrons with one spin direction are present.
We found that CoMnSb, NiMnSb and CuMnSb have a crystal structure transition at temperatures below their melting point. The best specimens could be obtained by annealing at temperatures below these crystal structure transitions. AuMnSb was found to have an incongruent melting point. ...

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