Charge fluctuations in the intermediate-valence ground state of SmCoIn₅

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Tam, David W.</dc:creator>
  <dc:creator>Colonna, Nicola</dc:creator>
  <dc:creator>Kumar, Neeraj</dc:creator>
  <dc:creator>Piamonteze, Cinthia</dc:creator>
  <dc:creator>Alarab, Fatima</dc:creator>
  <dc:creator>Strocov, Vladimir</dc:creator>
  <dc:creator>Cervellino, Antonio</dc:creator>
  <dc:creator>Fennell, Tom</dc:creator>
  <dc:creator>Gawryluk, Dariusz Jakub</dc:creator>
  <dc:creator>Pomjakushina, Ekaterina</dc:creator>
  <dc:creator>Soh, Yeong-Ah</dc:creator>
  <dc:creator>Kenzelmann, Michele</dc:creator>
  <dc:description>The microscopic mechanism of heavy band formation, relevant for unconventional superconductivity in CeCoIn₅ and other Ce-based heavy fermion materials, depends strongly on the efficiency with which f electrons are delocalized from the rare earth sites and participate in a Kondo lattice. Replacing Ce³⁺ (4f 1, J = 5/2) with Sm³⁺ (4f 5, J = 5/2), we show that a combination of crystal field and on-site Coulomb repulsion causes SmCoIn₅ to exhibit a Γ7 ground state similar to CeCoIn5 with multiple f electrons. Remarkably, we also find that with this ground state, SmCoIn₅ exhibits a temperature-induced valence crossover consistent with a Kondo scenario, leading to increased delocalization of f holes below a temperature scale set by the crystal field, Tv ≈ 60 K. Our result provides evidence that in the case of many f electrons, the crystal field remains the most important tuning knob in controlling the efficiency of delocalization near a heavy fermion quantum critical point, and additionally clarifies that charge fluctuations are present and may play a generally important role in the ground state of “115” materials.</dc:description>
  <dc:publisher>Materials Cloud</dc:publisher>
  <dc:rights>Creative Commons Attribution 4.0 International</dc:rights>
  <dc:subject>Heavy Fermions</dc:subject>
  <dc:subject>Mixed valence</dc:subject>
  <dc:title>Charge fluctuations in the intermediate-valence ground state of SmCoIn₅</dc:title>