Helical Spin Structures in c-Axis Dy/Y Superlattice |
| M. Seroczyńska and J. Kociński Warsaw University of Technology, Institute of Physics, Koszykowa 75, 00-662 Warszawa, Poland |
| Received: August 25, 1995 |
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| On the basis of Landau's theory of symmetry changes at continuous phase transitions, we have derived the formulae for two incommensurate helical spin structures which are symmetry allowed in Dy/Y superlattice, when the helical axis is parallel to the c-axis of the hexagonal lattice. These structures have different extinction coefficients in their cross-sections for magnetic scattering of neutrons and therefore can be distinguished by experiment. Magnetic satellite peaks around the reciprocal lattice points K + 0 are allowed for only one of these spin structures, namely that inferred from earlier experiments. |
| DOI: 10.12693/APhysPolA.89.99 PACS numbers: 75.70.Fr, 75.70.-i |