Magnetic and magnetoelastic properties of the TbMnSi and Tb 0.5La0.5MnSi compoundsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:X-ray diffraction studies showed substitution of nonmagnetic lanthanum for terbium in the TbMnSi polycrystalline compound to initiate a structural transition from a TiNiSi-type orthorhombic structure (for TbMnSi) to a CeFeSi-type tetragonal phase (for Tb0.5La0.5MnSi). Magnetic measurements (of the magnetization, magnetostriction, thermal expansion) performed on Tb0.5La0.5MnSi revealed a change in the character of magnetic ordering, the appearance of a ferromagnetic component in the Mn magnetic moment, a strong increase in magnetization as compared to TbMnSi, and the appearance of a spontaneous magnetic moment. Insertion of the lanthanum ion onto the rare-earth sublattice of TbMnSi brings about a change in the unit cell size and, hence, in the Mn-Mn, Mn-Si, and R-Mn interatomic distances, which causes, in turn, a change in the character of exchange interactions in Tb0.5La0.5MnSi and the formation of a complex magnetic structure.