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arXiv · 1805.01918

Low-carrier density and fragile magnetism in a Kondo lattice system

Binod K. Rai·Iain W. H. Oswald·Wenjing Ban·C. -L. Huang·V. Loganathan·A. M. Hallas·M. N. Wilson·G. M. Luke·L. Harriger·Q. Huang·Y. Li·Sami Dzsaber·Julia Y. Chan·N. L. Wang·Silke Paschen·J. W. Lynn·Andriy H. Nevidomskyy·P. Dai·Q. Si·E. Morosan
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Abstract

Kondo-based semimetals and semiconductors are of extensive current interest as a viable platform for strongly correlated states. It is thus important to understand the routes towards such dilute-carrier correlated states. One established pathway is through Kondo effect in metallic non-magnetic analogues. Here we advance a new mechanism, through which Kondo-based semimetals develop out of conduction electrons with a low carrier-density in the presence of an even number of rare-earth sites. We demonstrate this effect by studying the Kondo material Yb3Ir4Ge13 along with its closed-f-shell counterpart, Lu3Ir4Ge13. Through magnetotransport, optical conductivity and thermodynamic measurements, we establish that the correlated semimetallic state of Yb3Ir4Ge13 below its Kondo temperature originates from the Kondo effect of a low carrier conduction-electron background. In addition, it displays fragile magnetism at very low temperatures, which, in turn, can be tuned to a non Fermi liquid regime through Lu-for-Yb substitution. These findings are connected with recent theoretical studies in simplified models. Our results open an entirely new venue to explore the strong correlation physics in a semimetallic environment.

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Binod K. Rai, Iain W. H. Oswald, Wenjing Ban, C. -L. Huang, V. Loganathan, A. M. Hallas, M. N. Wilson, G. M. Luke, L. Harriger, Q. Huang, Y. Li, Sami Dzsaber, Julia Y. Chan, N. L. Wang, Silke Paschen, J. W. Lynn, Andriy H. Nevidomskyy, P. Dai, Q. Si, E. Morosan. 2018-05-04. Low-carrier density and fragile magnetism in a Kondo lattice system. https://doi.org/10.1103/physrevb.99.085120

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