Modulated spin-liquid and magnetic order from a Kondo-Heisenberg model applied to U Ru 2 Si 2Report as inadecuate




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1 IPHT - Institut de Physique Théorique - UMR CNRS 3681 2 LOMA - Laboratoire Ondes et Matière d-Aquitaine 3 IIP-UFRN - International Institute of Physics, Universidade Federal do Rio Grande do Norte

Abstract : Using the Kondo-Heisenberg model framework, we analyze the effect of charge fluctuations in the modulated spin liquid MSL and in the antiferromagnetic AF ordering which were introduced by Pépin et al. Phys. Rev. Lett. 106, 106601 2011 and Thomas et al. Phys. Rev. B 87, 014422 2013. Coupling the spin liquid to the charge sector enables us to discuss the formation of the Kondo effect in this system. As a result, we are able to observe the emergence of two phases showing the coexistence of the Kondo effect and the MSL Kondo-MSL phase and the coexistence of the Kondo-MSL-AF phases. We discuss the critical lines separating the coexisting Kondo-MSL and Kondo-MSL-AF phases. Our model produces promising results as regards to the experimental temperature-pressure phase diagram and to the two gap openings observed in URu2Si2.

Keywords : Transition-metal compounds Quantum critical phenomena Quantum spin liquids valence bond phases and related phenomena Orbital charge and other orders including coupling of these orders





Author: X. Montiel - S. Burdin - C. Pépin - A. Ferraz -

Source: https://hal.archives-ouvertes.fr/



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