[Wien] Why the antiferromagnetic structure of Cr is still cubic

[delamora]

In NiO the Ni makes an FCC structure, you cannot have an antiferromagnetic arrangement in a triangular lattice (for example in 1,1,1 planes), even less in the FCC, which is triangular in many planes, so there is what is called "geometrical frustration"

On the other hand, in Cr you have the "Cr up" and "Cr dn" alternated and you can have a clear antiferromagnetic arrangement

Pablo
________________________________
De: Wien <wien-bounces at zeus.theochem.tuwien.ac.at> en nombre de Abderrahmane Reggad <jazairdz at gmail.com>
Enviado: miércoles, 8 de junio de 2016 05:43 a. m.
Para: wien at zeus.theochem.tuwien.ac.at
Asunto: [Wien] Why the antiferromagnetic structure of Cr is still cubic


Dear wien2k users

I have read that the antiferromagnetic ordering is accompanied with a little structural distortion as in the case of NiO. This latter is characterized by a distortion from NaCl to rhomboherdral structure; but for the chromide Cr the structure is still cubic when there is a magnetic transition from paramagnetic to antiferromagnetic state.

Best regards
--
Mr: A.Reggad
Laboratoire de Génie Physique
Université Ibn Khaldoun - Tiaret
Algerie


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