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Response of Kondo Lattice Systems to Pressure
Abstract At relatively high temperatures a Kondo lattice acts as a collection of non-interacting Kondo impurities having their own characteristic energy scale that is set by local, intrasite coupling of the impurity spin to the spin of conduction electrons. However, at very low temperatures an interaction between periodically placed Kondo impurities leads to band-like behavior of strongly mass-enhanced quasiparticles that may be described in terms of Landau Fermi liquid models.1 The transition between these two extreme regimes of ten results in a maximum in the electrical resistivity or Hall coefficient.2 The mechanism(s) responsible for producing the intersite coupling remains unclear, although both RKKY and quadrupolar exchange have been suggested as possible sources.3−5 Recent neutron scattering experiments on heavy electron Kondo lattice compounds reveal the presence of magnetic interactions at finite q, even in those materials that become superconducting or show no phase transition to very low temperatures.6,7 The apparently inescapable conclusion, then, is that there are at least two competing mechanisms, Kondo (intrasite) and magnetic (intersite), present in Kondo lattice systems. Presumably, it is this competition that leads both to the variety of ground state configurations found in these materials and to low temperature phase coherence in the Kondo scattering,3,5.
Response of Kondo Lattice Systems to Pressure
Abstract At relatively high temperatures a Kondo lattice acts as a collection of non-interacting Kondo impurities having their own characteristic energy scale that is set by local, intrasite coupling of the impurity spin to the spin of conduction electrons. However, at very low temperatures an interaction between periodically placed Kondo impurities leads to band-like behavior of strongly mass-enhanced quasiparticles that may be described in terms of Landau Fermi liquid models.1 The transition between these two extreme regimes of ten results in a maximum in the electrical resistivity or Hall coefficient.2 The mechanism(s) responsible for producing the intersite coupling remains unclear, although both RKKY and quadrupolar exchange have been suggested as possible sources.3−5 Recent neutron scattering experiments on heavy electron Kondo lattice compounds reveal the presence of magnetic interactions at finite q, even in those materials that become superconducting or show no phase transition to very low temperatures.6,7 The apparently inescapable conclusion, then, is that there are at least two competing mechanisms, Kondo (intrasite) and magnetic (intersite), present in Kondo lattice systems. Presumably, it is this competition that leads both to the variety of ground state configurations found in these materials and to low temperature phase coherence in the Kondo scattering,3,5.
Response of Kondo Lattice Systems to Pressure
Thompson, J. D. (author) / Borges, H. A. (author) / Fisk, Z. (author) / Horn, S. (author) / Parks, R. D. (author) / Wells, G. L. (author)
1987-01-01
8 pages
Article/Chapter (Book)
Electronic Resource
English
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