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Article Dans Une Revue Communications Materials Année : 2022

Dual Kondo effect charge ordering and zero thermal expansion in a correlated intermetallic

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The possibility that valency changes due to the Kondo effect induce a charge-density-wave (CDW) transition and lead to zero-thermal-expansion by compensating the accompanying structural changes is appealing from both a fundamental and applied physics perspective. Theoretical studies have predicted CDW-order caused by the Kondo effect, whereby a material would exhibit a temperature-dependent dual Kondo effect comprising of two sublattices with different single-ion Kondo temperatures, but its experimental realization remains elusive. Here, we show direct evidence of a dual Kondo effect providing the electronic energy gain for a CDW accompanied by zero-thermal-expansion, in a strongly correlated f -electron material. YbPd undergoes a cubic to tetragonal transition with an incommensurate-CDW below T 1 = 130 K, which becomes commensurate below T 2 = 105 K. Bulk-sensitive spectroscopy reveals temperature-independent ytterbium single-site mixed-valence above T 1 , and a clear temperature-dependent mixed-valence charge-disproportionation of two crystallographic ytterbium sites in the CDW phases. Simplified single-impurity Anderson model calculations prove existence of a dual Kondo mixed-valency coupled to the CDW changes associated with the two ytterbium sites, and quantify site-dependent single-ion Kondo temperatures. The dual Kondo temperatures track the evolution of lattice parameters, resulting in a cell-volume compensated Kondo-CDW phase. The results provide a route to develop room temperature intermetallic zero-thermal-expansion materials.
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hal-03894582 , version 1 (12-12-2022)

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Yen-Fa Liao, Bodry Tegomo Chiogo, Thomas Clausse, Thomas Mazet, Ku-Ding Tsuei, et al.. Dual Kondo effect charge ordering and zero thermal expansion in a correlated intermetallic. Communications Materials, 2022, 3, pp.23. ⟨10.1038/s43246-022-00243-5⟩. ⟨hal-03894582⟩
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