Large magnetoresistance in intermetallic compounds R2Mn3Si5 (R = Tb, Dy, Ho)статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Magnetization (M) and magnetoresistance (MR) measurements on polycrystalline R2Mn3Si5 (R = Tb, Dy and Ho) compounds (tetragonal, space group P4/mnc) have been carried out in the temperature range of2 K–300 K, in various applied fields. Both, the rare earth and Mn, are found to carry magnetic moments in these compounds. Mn has two sub-lattices (Mn1 and Mn2) that order magnetically at two different temperatures. Rare-earth and Mn1 moments order ferromagnetically at TC1 whereas Mn2 is found to magnetically order at TC2 (TC1 = 89K, 86K, 78K and TC2 = 18K, 34K, 16K for R = Tb, Dy and Ho compounds, respectively). Magnetoresistance measurements reveal large negative MR values ofab out 50% near TC2 at 9T in all these compounds. This giant magnetoresistance is attributed to the spin-dependent scattering effects, competing exchange interactions and the layered structure ofthese compounds.