Magnetic precursor effects, electrical and magnetoresistance anomalies, and heat-capacity behavior of Gd alloys

Mallik, R. ; Sampathkumaran, E. V. (1998) Magnetic precursor effects, electrical and magnetoresistance anomalies, and heat-capacity behavior of Gd alloys Physical Review B: Condensed Matter and Materials Physics, 58 (14). pp. 9178-9184. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v58/i14/p9178_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.58.9178

Abstract

The electrical resistivity (ρ), magnetoresistance (Δρ/ρ), heat capacity (C), and magnetization (M) behavior in a number of Gd alloys are reported. Particular attention is paid to the ρ and Δρ/ρ behavior at temperatures just above respective long-range magnetic ordering temperatures (T0). In some compounds,e.g., GdNi2Sn2 and GdPt2Ge2, there is an enhancement of ρ prior to long-range magnetic order over a wide temperature range which can be highlighted by the suppression of ρ caused by the application of a magnetic field. However, such features are absent in many other Gd compounds, e.g., GdCu2Ge2, GdAg2Si2, GdAu2Si2, GdPd2Ge2, and GdCo2Si2. Attempts to relate these features to magnetic precursor effects in C are made. We observe interesting features in the C data, like shoulders and additional transitions in the magnetically ordered state and peak values of C at T0 varying from one compound to the other. The implications of these observations are discussed. In addition, various Δρ/ρ anomalies, including large positive values at low temperatures in some cases, and the sensitivity of magnetoresistance to field-induced magnetic transitions in comparison with the isothermal M data, are also brought out.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:45629
Deposited On:29 Jun 2011 03:24
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