Magnetoresistance in GdNi: magnetic-polaronic-like effect near the Curie temperature and low-temperature sign reversal

Mallik, R. ; Sampathkumaran, E. V. ; Paulose, P. L. ; Nagarajan, V. (1997) Magnetoresistance in GdNi: magnetic-polaronic-like effect near the Curie temperature and low-temperature sign reversal Physical Review B: Condensed Matter and Materials Physics, 55 (14). R8650-R8653. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v55/i14/pR8650_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.55.R8650

Abstract

The results of magnetoresistance (Δρ/ρ) measurements in GdNi, in the temperature range 4.2 to 300 K, are reported. The sign of Δρ/ρ above the Curie temperature (TC=70 K) is negative and its magnitude in a magnetic field of 80 kOe grows with decreasing temperature below 150 K with a peak value of about −20% at TC. These features, qualitatively resembling those in giant magnetoresistance systems (manganates), are attributed to the formation of some kind of magnetic polarons induced by Gd. The magnetoresistance changes sign below 12 K which is attributed to subtle band-structure effects.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:45657
Deposited On:29 Jun 2011 03:22
Last Modified:18 May 2016 01:51

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