Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 44: Critical Phenomena and Phase Transitions
DY 44.4: Vortrag
Mittwoch, 9. März 2016, 16:15–16:30, H47
Discovery of a new phase with magnetic short range correlations and its possible relevance for the hidden order in URu2Si2 — •Steffen Sykora1 and Klaus W. Becker2 — 1IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — 2Technische Universität Dresden, D-01062 Dresden, Germany
In this paper we discuss a new phase of the Kondo lattice model which arises from the competition of Kondo and RKKY energy scales. Normally the Kondo lattice model is used to capture the low-energy physics of heavy fermion systems. However, according to the so-called Doniach picture the Kondo state will be replaced by an antiferromagnetic state for the case that the Kondo energy scale becomes smaller than the magnetic interaction between magnetic ions. In the present study we start instead from a modified electronic one-particle dispersion which avoids nesting of particle-hole excitations. Thus the magnetic ordered state should be suppressed which provides an opportunity for the inset of a new low-energy state with competing Kondo and magnetic energies. As will be shown, this new state avoids magnetic symmetry breaking but leads to a number of physical properties which are relevant for the understanding of the hidden order state in URu2Si2.