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Structure and magnetic order of the Heusler compound Co2NbSn

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Michalak,  R.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mydosh,  J. A.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Süllow,  S.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Wolter, A. U. B., Bosse, A., Baabe, D., Maksimov, I., Mienert, D., Klauss, H. H., et al. (2002). Structure and magnetic order of the Heusler compound Co2NbSn. Physical Review B, 66(17): 174428, pp. 174428-174428. doi:10.1103/PhysRevB.66.174428.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-30DC-4
Abstract
We present a detailed study of the structural and magnetic phase transitions of the Heusler compound Co2NbSn. This material undergoes a structural transition at T-S=235 K from the cubic Heusler Fm3m high-temperature phase into an orthorhombic low-temperature lattice of Pmma symmetry. Further, the system exhibits a magnetic transition at T-C=116 K from para- to ferromagnetism. While on a macro- and mesoscopic scale Co2NbSn appears to be fully Fm3m ordered, from microscopic studies we find that on an atomic scale site disorder is present. We discuss the implications of these findings for the anomalous macroscopic physical properties and domain formation in the ferromagnetic state in Co2NbSn.