Low-carrier density and fragile magnetism in a Kondo lattice system Academic Article uri icon

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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.

authors

  • Rai, Binod K
  • Oswald, Iain WH
  • Ban, Wenjing
  • Huang, C-L
  • Loganathan, V
  • Hallas, AM
  • Wilson, MN
  • Luke, Graeme
  • Harriger, L
  • Huang, Q
  • Li, Y
  • Dzsaber, Sami
  • Chan, Julia Y
  • Wang, NL
  • Paschen, Silke
  • Lynn, JW
  • Nevidomskyy, Andriy H
  • Dai, Pengcheng
  • Si, Q
  • Morosan, E

publication date

  • February 12, 2019