Kondo exhaustion and conductive surface states in antiferromagnetic YbIr$_3$Si$_7$
Abstract
The interplay of Kondo screening and magnetic ordering in strongly correlated materials containing local moments is a subtle problem.[1] Usually the number of conduction electrons matches or exceeds the number of moments, and a Kondo-screened heavy Fermi liquid develops at low temperatures.[2] Changing the pressure, magnetic field, or chemical doping can displace this heavy Fermi liquid in favor of a magnetically ordered state.[3,4] Here we report the discovery of a version of such a `Kondo lattice' material, YbIrSi, in which the number of free charge carriers is much less than the number of local moments. This leads to `Kondo exhaustion':[5] the electrical conductivity tends to zero at low temperatures as all the free carriers are consumed in the formation of Kondo singlets. This effect coexists with antiferromagnetic long-range order, with a N\'eel temperature . Furthermore, the material shows conductive surface states with potential topological nature, and thus presents an exciting topic for future investigations.
Keywords
Cite
@article{arxiv.1908.11336,
title = {Kondo exhaustion and conductive surface states in antiferromagnetic YbIr$_3$Si$_7$},
author = {Macy Stavinoha and C. -L. Huang and W. Adam Phelan and Alannah M. Hallas and V. Loganathan and Jeffrey W. Lynn and Qingzhen Huang and Franziska Weickert and Vivien Zapf and Katharine R. Larsen and Patricia D. Sparks and James C. Eckert and Anand B. Puthirath and C. Hooley and Andriy H. Nevidomskyy and E. Morosan},
journal= {arXiv preprint arXiv:1908.11336},
year = {2019}
}