Magnetic properties of ZrNiAl-type R3Mn3GeGa2 compounds (R = Y, Gd, Tb, Dy, Ho and Er)статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Results of magnetization measurements on R3Mn3GeGa2 (R = Y, Gd, Tb, Dy, Ho, Er) compounds (hexagonal ZrNiAl-type structure; space group P62m, No.189) and powder neutron diffraction studies on Er3Mn3GeGa2 and Ho3Mn3GeGa2 are presented. Magnetization data reveal that the compounds with R = Y, Tb, Dy, Ho and Er order antiferromagnetically (TN) whereas Gd3Mn3GeGa2 compound shows signature of dominant ferromagnetic interactions. Y3Mn3GeGa2 shows complex antiferromagnetic behaviour, whereas {Gd–Er}3Mn3GeGa2 compounds show high-temperature magnetic transition that corresponds to the Mn-sublattice ordering and low-temperature magnetic transition that corresponds to the rare earth sublattice ordering which leads to complex magnetism. In applied field of 10mTthe Gd3Mn3GeGa2 orders at 198 K (TC). The Tb3Mn3GeGa2 compound orders antiferromagnetically at TN =140K and Tm =20 K,
respectively, whereas Dy3Mn3GeGa2 shows magnetic ordering only at 54K.
In zero applied field, Ho3Mn3GeGa2 has the magnetic ordering temperature at TN = 175(5)K and
Tm = 45(5) K, whereas Er3Mn3GeGa2 show magnetic transitions at TN = 170(5)K and Tm = 35(5) K. Neutron diffraction study reveals that the wave vector K1 is [1/3, 1/3, 0] for both the compounds. However, in Ho3Mn3GeGa2, the components with wave vector K2 = [1/2, 1/2, 0] appear on both rare earth and manganese sublattices below 45(5) K. Both the manganese and rare earth magnetic moments order in a noncollinear sine modulated magnetic structure in these compounds.