Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-11-27
Physics
Condensed Matter
Strongly Correlated Electrons
Summary of the invited talk delivered at the NATO Advanced Workshop on "Concept in Correlations", held at Hvar, Croatia, in Se
Scientific paper
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 ($\rho$) in the paramagnetic state, instead of remaining contant, surprisingly increases with decreasing temperature (T) in the paramagnetic state in some of the Gd alloys. In some cases, this "excess resistance" is so large that a distinct minimum in the plot of $\rho$ 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.
Mallik R.
Sampathkumaran E. V.
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