S. Akhanjee, A. M. Tsvelik
We discuss a model Kondo-type Hamiltonian representing an analytically tractable version of the model used by Yin {\it et.al.}, Phys. Rev. B{\bf 86}, 2399 (2012) to explain a non-Fermi liquid behavior of iron chalcogenides and ruthenates in the intermediate energy region. We consider a regime where a complete screening of the local degrees of freedom proceeds in two stages described by two characteristic energy scales $T_K^{orb} >> E_0$. The first scale marks a screening of the orbital degrees of freedom and the second one marks a crossover to the regime with coherent propagation of the quasiparticles.
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http://arxiv.org/abs/1303.7448
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