Abstract

We analyze the low temperature experimental magnetic field–temperature H– T phase diagram of CeCoIn 5. We demonstrate that its main features can be well explained within Landau quasiparticle picture incorporating the fact that quasiparticles form so-called fermion-condensate (FC) state emerging behind the fermion condensation quantum phase transition (FCQPT). We show that near FCQPT, the fluctuations are strongly suppressed while FC by itself is “protected” from above fluctuations by the first order phase transition. We demonstrate that the electronic system of CeCoIn 5 can be shifted from the ordered towards disordered side of FCQPT by the application of magnetic field therefore giving a unique possibility to study the relationship between quasiparticles and non-Fermi-liquid behavior.

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