- Jeroen Custers: Investigating lattices with multiple Kondo sites
- 26. 10. 2022, 14:10
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Strongly correlated electron systems with competing interactions provide a fertile ground for states of matter. Among the diverse aspects of the physics of strongly correlated electron systems, quantum critical points (QCPs) – continuous zero-temperature phase transitions – and the associated quantum critical phenomena are of particular interest. Pronounced quantum critical fluctuations associated with such points can lead to deviations from Fermi liquid behavior, and novel exotic phases including unconventional superconductivity. This has been extensively explored in heavy Fermion (HF) Kondo lattices on the edge of magnetic instability. Most of these HF materials investigated exhibit a single Kondo-site in the lattice.
In this presentation we focus on materials with multiple Kondo sites. Naively, these will be materials where local moments on various crystallographically inequivalent sites possess distinctly different Kondo couplings. It has been pointed out that one Kondo sublattice will directly influence the Kondo interaction on another [1,2]. We will present experimental (resistivity, magnetization, and specific heat) results on Ce3Rh4Sn7, CeRhSn2 and (Ce1-xLax)3In11. All these materials show rather complex magnetic behavior but only weak Kondo-type interaction.
 A. Benlagra et al., Phys. Rev. B 84, 075126 (2011).
 Mi Jiang et al., Phys. Rev. Research 4, 013222 (2022).