Kondo exhaustion and conductive surface states in antiferromagnetic YbIr3Si7

Macy Stavinoha, C.-L. Huang, W. Adam Phelan, Alannah M. Hallas, V. Loganathan, Jeffrey W. Lynn, Qingzhen Huang, Franziska Weickert, Vivien Zapf, Katharine R. Larsen, Patricia D. Sparks, James C. Eckert, Anand B. Puthirath, C. Hooley, Andriy H. Nevidomskyy, E. Morosan

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Jan 16, 2020
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Received Date: 6th January 20

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, YbIr3Si7, 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 Neel temperature TN = 4.1 K. Furthermore, the material shows conductive surface states with potential topological nature, and thus presents an exciting topic for future investigations.

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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.

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