Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.69: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

Kondo Effect in Bosonic Spin Liquids — •Lars Fritz, Serge Florens, and Matthias Vojta — Theorie der Kondensierten Materie, Universitaet Karlsruhe

In a metal, a magnetic impurity gets fully screened at low temperatures by the conduction electrons. In contrast, an impurity coupled to spin-1 bulk bosons, such as triplet excitations in paramagnets, is only partially screened, even at the bulk quantum critical point, where the excitations are gapless. We argue that this difference is not due to the statistics of the host particles, but instead related to the structure of the impurity-bulk coupling. We show that in frustrated quantum magnets with bosonic spinon excitations one can observe a bosonic version of the Kondo effect.