Spin Configuration of Magnetic Ions on B-Sites in Normal Cubic Spinels

概要

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The ground state spin configuration in normal cubic spinels having magnetic ions on B-sites only is studied, with the assumption of four superexchange interactions. Spin configurations are constructed using one wavevector or two wavevectors restricted along one of [001], [110], and [111], and their stability is studied with respect to wavevectors in the whole Brillouin zone. It is shown that a helix with a wavevector (0,0,k) is stable in a certain region in the exchange-parameter space. Two helices with (k,k,0) and (k,k,k), and the Yafet-Kittel type configuration have lower energies than all other constructed configurations in certain limited regions, but they are not the ground state. A conehelix [110] having a conical structure in two sublattices and a coplanar helical structure in the other two sublattices has the lowest energy in a large region of the parameter space among all the configurations constructed with two wavevectors. Relevant observed spin structures are discussed.
社団法人日本物理学会の論文
1971-09-05