JaKeYu
Nov15-11, 11:11 PM
I came across it in S.Blundell's "Magnetism in Condensed Matter"(P126),it said that the isotropic Heisenberg ferromagnet possesses rotational symmetry.I want to know in 3 dimensions,is there is any real lattice structure(like cubic) corresponding to it ?Does the "rotational symmetry" means any fold is OK?Or it has to be isotropic and is only a theoretical model that doesnot exit in reality?