  Hund's metal is one kind of correlated metal, in which the electronic
correlation is strongly influenced by the Hund's interaction. At high
temperatures, while the charge and orbital degrees of freedom are quenched, the
spin degrees of freedom can persist in terms of frozen moments. As temperature
decreases, a coherent electronic state with characteristic orbital
differentiation always emerges at low temperatures through an
incoherent-to-coherent crossover, which has been widely observed in iron-based
superconductors (e.g., iron selenides and AFe2As2 (A = K, Rb, Cs)).
Consequently, the above frozen moments are "screened" by coupling to orbital
degrees of freedom, leading to an emergent Fermi-liquid state. In contrast, the
coupling among frozen moments should impede the formation of the Fermi-liquid
state by competitive magnetic ordering, which is still unexplored in Hund's
metal. Here, in the iron-based Hund's metal CsFe2As2, we adopt a chemical
substitution at iron sites by Cr/Co atoms to explore the competitive magnetic
ordering. By a comprehensive study of resistivity, magnetic susceptibility,
specific heat and nuclear magnetic resonance, we demonstrate that the
Fermi-liquid state is destroyed in Cr-doped CsFe2As2 by a spinfreezing
transition below T_g ~ 22 K. Meanwhile, the evolution of charge degrees of
freedom measured by angle-resolved photoemission spectroscopy also supports the
competition between the Fermi-liquid state and spin-glass state.
