Paradigm for finding d-electron heavy fermions: the case of Cr-doped CsFe$_2$As$_2$
arxiv(2023)
摘要
We define a general strategy for finding new heavy-fermionic materials
without rare-earth elements: doping a Hund metal with pronounced
orbital-selective correlations towards half-filling. We argue that in general
band structures a possible orbital-selective Mott transition is frustrated by
inter-orbital hopping into heavy-fermion behaviour - where d-orbitals provide
both the heavy and the light electrons - which is enhanced when approaching
half-filling. This phase ultimately disappears due to magnetic correlations, as
in a standard Doniach diagram. Experimentally we have further hole doped
CsFe$_2$As$_2$, a Hund metal with 0.5 electrons/Fe away from half-filling, and
obtained a heavy fermionic state with the highest Sommerfeld coefficient for
Fe-pnictides to date (270 mJ/mol K$^2$), before signatures of an
antiferromagnetic phase set in.
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