{
  "id": "1306.5141",
  "version": "v1",
  "published": "2013-06-21T14:00:55.000Z",
  "updated": "2013-06-21T14:00:55.000Z",
  "title": "Phase diagram and critical behavior of the random ferromagnet $Ga_{1-x}Mn_xN$",
  "authors": [
    "S. Stefanowicz",
    "G. Kunert",
    "C. Simserides",
    "J. A. Majewski",
    "W. Stefanowicz",
    "C. Kruse",
    "S. Figge",
    "Tian Li",
    "R. Jakiela",
    "K. N. Trohidou",
    "A. Bonanni",
    "D. Hommel",
    "M. Sawicki",
    "T. Dietl"
  ],
  "comment": "5 pages, 5 figures",
  "journal": "Phys. Rev. B 88, 081201(R) (2013)",
  "doi": "10.1103/PhysRevB.88.081201",
  "categories": [
    "cond-mat.dis-nn",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "Molecular beam epitaxy has been employed to obtain Ga1-xMnxN films with x up to 10% and Curie temperatures T_C up to 13 K. The magnitudes of T_C and their dependence on x, T_C(x) ~ x^m, where m = 2.2 +/- 0.2 are quantitatively described by a tight binding model of superexchange interactions and Monte Carlo simulations of T_C. The critical behavior of this dilute magnetic insulator shows strong deviations from the magnetically clean case (x = 1), in particular, (i) an apparent breakdown of the Harris criterion; (ii) a non-monotonic crossover in the values of the susceptibility critical exponent gamma_eff between the high temperature and critical regimes, and (iii) a smearing of the critical region, which can be explained either by the Griffiths effects or by macroscopic inhomogeneities in the spin distribution with a variance Delta x = (0.2 +/- 0.1)%.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-06-21T14:00:55.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "75.50.Pp",
      "61.72.uj",
      "75.30.Et",
      "75.40.Cx"
    ],
    "keywords": [
      "critical behavior",
      "phase diagram",
      "random ferromagnet",
      "monte carlo simulations",
      "molecular beam epitaxy"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2013,
      "month": "Aug",
      "volume": 88,
      "number": 8,
      "pages": "081201"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2013PhRvB..88h1201S"
    }
  }
}