Abstract
New quarternary Heusler alloys of composition (Cu1−xCox)2 MnSn (X = 0–1) were prepared single phase with the cubic L21 structure. Magnetic measurements were undertaken in the ferromagnetic region and in case of alloys with a higher Co content in the paramagnetic region, too. Cu rich samples showed a phase transition similar to that in Cu2MnSn on heating. The Curie temperature exhibited a sharp minimum at Cu1.5Co0.5MnSn. This can be explained assuming a superposition of two different types of interaction: one between Co-Mn and Co-Co and the other between Mn-Mn atoms which are both strongly dependent on composition. The Mn-Mn interaction is discussed on the basis of Stearns’ model (indirect di-d1 interaction). Whereas the moment of Mn in Heusler alloys is usually approx. 4 μB it is only 3.6 μB in those with Co which is explained by a certain kind of disorder. Co itself contributed 0.7 μB to the overall moment. A drastic drop of the magnetic moment of Co was found from 0.7 μB in Co2MnSn to 0.3 μB in the quaternary alloys (Cu1−xCox)2MnSn for x as small as 0.05. a)Work supported by Österreichische Fonds zur Forderung der wissenschaftlichen Forschung. 1E. Uhl and R. Sobczak, Solid State Commun. 39, 655 (1981). 2M. B. Stearns, J. Magn. Magn. Mater. 15–18, 301 (1980).
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