Suppression of the Mass Enhancement in CaCu3Ru4O12 - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: We have investigated heavy-fermion behavior of the transition-metal oxidesACu3Ru4O12 A = Na, Ca, La, and their mixtures. It has been known thatCaCu3Ru4O12 exhibits Kondo-like behavior attributable to Cu2+ 3d electrons,similar to that of some Ce-based heavy-fermion systems. However, we findstriking -suppression- of the mass enhancement in CaCu3Ru4O12, in which theKondo-like effect is most pronounced. Such decrease of the density of states isreminiscent of the coherent gap formation in Kondo lattice systems.Nevertheless, the behavior can not be interpreted within the conventional Kondopicture with localized moments, because the Cu electrons are apparentlyitinerant. The present results indicate the importance of the duality oflocalized and itinerant nature, found also in some other d-electron systemswhich exhibit the Kondo-like behavior.



Autor: Soutarou Tanaka, Hiroshi Takatsu, Shingo Yonezawa, Yoshiteru Maeno

Fuente: https://arxiv.org/







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