Magnetoresistance studies of Ho0.85Tb0.15Mn2-xFex (x=0, 0.25, 0.5, 1, and 2)

Chelvane, J. Arout ; Markandeyulu, G. ; Kumar, N. Harish ; Nirmala, R. ; Malik, S. K. (2005) Magnetoresistance studies of Ho0.85Tb0.15Mn2-xFex (x=0, 0.25, 0.5, 1, and 2) Physical Review B, 72 (9). 092406_1-092406_4. ISSN 0163-1829

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Magnetoresistance (Δρ/ρ) studies have been carried out on the C15-type cubic Laves phase Ho0.85Tb0.15Mn2-xFex (x=0, 0.25, 0.5, 1, and 2) compounds up to a magnetic field of 90 kOe at temperatures 5, 30, and 100K. The lattice parameters were found to decrease with increasing x. The Curie temperature is found to increase with increasing x from 30 to 680K, which is attributed to the net increase in the exchange splitting of the spin-up and spin-down bands. A maximum value of Δρ/ρ of -27% was observed for Ho0.85Tb0.15Mn2 around the ordering temperature. This is explained on the basis of nearest Mn-Mn critical distance. A positive magnetoresistance, increasing in a discontinuous manner with increasing field, due to the dependence of scattering of conduction electrons on large magnetoelastic interactions, was observed at 5K in Ho0.85Tb0.15Fe2.

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Source:Copyright of this article belongs to American Physical Society.
ID Code:23146
Deposited On:25 Nov 2010 13:27
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