Sampathkumaran, E. V. ; Mallik, R. (2003) Do we understand electron correlation effects in Gadolinium based intermetallic compounds? NATO Science Series, 110 . pp. 353-361. ISSN 1568-2609
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Official URL: http://www.springerlink.com/content/j5576ku7516314...
Related URL: http://dx.doi.org/10.1007/978-94-010-0213-4_35
Abstract
Recognising the difficulties in systematic understanding of the physical characteristics of strongly correlated f-electron systems, we considered it worthwhile to subject the so-called "normal" f-electron systems like those of Gd to careful investigations. We find that the spin-disorder contribution to electrical resistivity (p) in the paramagnetic state, instead of remaining constant, apparently shows an increase as the temperature (T) is lowered towards magnetic ordering temperature in some of the Gd alloys. In some cases, the T-dependence of "excess resistance" is so large that a distinct minimum in the plot of ρ versus T can be seen, mimicking the behaviour of Kondo lattices. This excess resistance can be suppressed by the application of a magnetic field, naturally resulting in large magnetoresistance. In addition, these alloys are found to exhibit heavy-fermion-like heat-capacity behavior. These unusual findings imply hither-to-unexplored electron correlation effects even in Gd-based alloys.
Item Type: | Article |
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Source: | Copyright of this article belongs to Springer. |
Keywords: | Gd Compounds; Electron Correlations; Kondo Effect; Heavy Fermions; Spin Disorder; Electrical Resistivity; Kondo Lattice; Magnetic Polaron; Heat Capacity; Magnetoresistance |
ID Code: | 93053 |
Deposited On: | 08 Jun 2012 09:17 |
Last Modified: | 19 May 2016 06:13 |
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