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Magnetization (M) and magnetoresistance (MR) measurements on polycrystallineR2Mn3Si5 (R = Tb, Dy and Ho) compounds (tetragonal, space group P4/mnc) havebeen carried out in the temperature range of 2 K-300 K, in various appliedfields. Both, the rare earth and the Mn, are found to carry magnetic moments inthese compounds. Mn has two sub-lattices (Mn1 and Mn2) that order magneticallyat two different temperatures. Rare earth and Mn1 moments orderferromagnetically at TC1 whereas Mn2 is found to magnetically order at TC2 (TC1= 89 K, 86 K, 78 K and TC2 = 18 K, 34 K, 16 K for R = Tb, Dy and Ho compounds,respectively). Magnetoresistance measurements reveal large negative MR valuesof about 50 % near TC2 at 9 T in all these compounds. This giantmagnetoresistance is attributed to the spin-dependent scattering effects,competing exchange interactions and the layered structure of these compoundsComment: Submitted to Europhys. Let

Large magnetoresistance in intermetallic compounds R 2 Mn 3 Si 5 (R = Tb, Dy and Ho)

Large magnetoresistance in intermetallic compounds R ₂ Mn ₃ Si ₅ (R = Tb, Dy and Ho)