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標題: Magnetism and transport properties of metamagnetic Mn1-xCrxAu2
作者: Nagata, Y.
Hagii, T.
Samata, H.
Uchida, T.
Abe, S.
Sung, C.F.
Lan, M.D.
關鍵字: Mn1-xCrxAu2;magnetism;metamagnetic;magnetoresistance;giant magnetoresistance
Project: Journal of Alloys and Compounds
期刊/報告no:: Journal of Alloys and Compounds, Volume 284, Issue 1-2, Page(s) 47-53.
Crystallographic, magnetic and electric properties of metamagnetic Mn1-xCrxAu2 were studied. Pure MnAu2 has a helical-spin structure and the structure changes to a ferromagnetic state below the Neel temperature T-N (similar to 360 K) and above a threshold magnetic field H-th (similar to 10 kOe at 300 K). The T-N, H-th for the metamagnetic transition, and the helical angle of the helical-spin configuration decreases as the Cr content x increases. The Cr substitution seems to dilute the magnetism of MnAu2 and to weaken the interlayer magnetic coupling between the Mn spins. A significant magnetoresistance as large as 3.5% was observed at room temperature in magnetic fields below 10 kOe. The metamagnetic transition seems to give rise to the magnetoresistance via s-d scattering. (C) 1999 Elsevier Science S.A. All rights reserved.
ISSN: 0925-8388
DOI: 10.1016/s0925-8388(98)00938-4
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