{
  "id": "1110.6336",
  "version": "v1",
  "published": "2011-10-28T13:59:14.000Z",
  "updated": "2011-10-28T13:59:14.000Z",
  "title": "Anderson lattice with explicit Kondo coupling: general features and the field-induced suppression of heavy-fermion state in ferromagnetic phase",
  "authors": [
    "Olga Howczak",
    "Józef Spałek"
  ],
  "journal": "J. Phys.: Condens. Matter 24 205602 (2012)",
  "doi": "10.1088/0953-8984/24/20/205602",
  "categories": [
    "cond-mat.str-el"
  ],
  "abstract": "We apply the extended (statistically-consistent, SGA) Gutzwiller-type approach to the periodic Anderson model (PAM) in an applied magnetic field and in the strong correlation limit. The finite-U corrections are included systematically by transforming PAM into the form with Kondo-type interaction and residual hybridization, appearing both at the same time. This effective Hamiltonian represents the essence of \\textit{Anderson-Kondo lattice model}. We show that in ferromagnetic phases the low-energy single-particle states are strongly affected by the presence of the applied magnetic field. We also find that for large values of hybridization strength the system enters the so-called \\textit{locked heavy fermion state}. In this state the chemical potential lies in the majority-spin hybridization gap and as a consequence, the system evolution is insensitive to further increase of the applied field. However, for a sufficiently strong magnetic field, the system transforms from the locked state to the fully spin-polarized phase. This is accompanied by a metamagnetic transition, as well as by drastic reduction of the effective mass of quasiparticles. In particular, we observe a reduction of effective mass enhancement in the majority-spin subband by as much as 20% in the fully polarized state. The findings are consistent with experimental results for Ce$_x$La$_{1-x}$B$_6$ compounds. The mass enhancement for the spin-minority electrons may also diminish with the increasing field, unlike for the quasiparticles states in a single narrow band in the same limit of strong correlations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-10-28T13:59:14.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "explicit kondo coupling",
      "ferromagnetic phase",
      "heavy-fermion state",
      "anderson lattice",
      "general features"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Journal of Physics Condensed Matter",
      "year": 2012,
      "month": "May",
      "volume": 24,
      "number": 20,
      "pages": 205602
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012JPCM...24t5602H"
    }
  }
}