Anomalous magnetoresistance in antiferromagnetic polycrystalline materials R2Ni3Si5 (R=rare earth)

Mazumdar, Chandan ; Nigam, A. K. ; Gupta, L. C. ; Nagarajan, R. ; Chandra, G. ; Padalia, B. D. ; Godart, C. ; Vijayaraghavan, R. (1997) Anomalous magnetoresistance in antiferromagnetic polycrystalline materials R2Ni3Si5 (R=rare earth) Journal of Applied Physics, 81 (8). pp. 5781-5783. ISSN 0021-8979

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Magnetoresistance (MR) studies on polycrystalline R2Ni3Si5, (R=Y, rare earth) which order antiferromagnetically at low temperatures, are reported here. MR of the Nd, Sm, and Tb members of the series exhibit positive giant magnetoresistance, largest among polycrystalline materials (85%, 75%, and 58% for Tb2Ni3Si5, Sm2Ni3Si5, and Nd2Ni3Si5, respectively, at 4.4 K in a field of 45 kG). These materials have, to the best of our knowledge, the largest positive GMR reported ever for any bulk polycrystalline compounds. The magnitude of MR does not correlate with the rare earth magnetic moments. We believe that the structure of these materials, which can be considered as a naturally occurring multilayer of wavy planes of rare earth atoms separated by Ni-Si network, plays a role. The isothermal MR of other members of this series (R=Pr,Dy,Ho) exhibits a maximum and a minimum, below their respective TN's. We interpret these in terms of a metamagnetic transition and short-range ferromagnetic correlations. The short-range ferromagnetic correlations seem to be dominant in the temperature region just above TN.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Rare Earth Alloys; Giant Magnetoresistance; Magnetic Moments; Neel Temperature; Metamagnetism; Ferromagnetic Materials; Short-range Order; Ferromagnetic-antiferromagnetic Transitions; Nickel Alloys; Silicon Alloys; Samarium Alloys; Yttrium Alloys; Terbium Alloys; Neodymium Alloys; Magnetoresistance; Polycrystals; Antiferromagnetic Materials; Electron Correlation; Phase Transformations
ID Code:11326
Deposited On:09 Nov 2010 03:34
Last Modified:02 Jun 2011 05:03

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