{
  "id": "cond-mat/0404570",
  "version": "v1",
  "published": "2004-04-23T12:06:41.000Z",
  "updated": "2004-04-23T12:06:41.000Z",
  "title": "Percolation and Colossal Magnetoresistance in Eu-based Hexaborides",
  "authors": [
    "G. A. Wigger",
    "C. Beeli",
    "E. Felder",
    "H. R. Ott",
    "A. D. Bianchi",
    "Z. Fisk"
  ],
  "comment": "4 pages, 5 figures, submitted to PRL",
  "doi": "10.1103/PhysRevLett.93.147203",
  "categories": [
    "cond-mat.mtrl-sci",
    "cond-mat.str-el"
  ],
  "abstract": "Upon substituting Ca for Eu in the local-moment ferromagnet EuB$_6$, the Curie temperature $T_C$ decreases substantially with increasing dilution of the magnetic sublattice and is completely suppressed for $x$ $\\leq$ 0.3. The Ca substitution leads to significant changes of the electronic properties across the Eu$_x$Ca$_{1-x}$B$_6$ series. Electron microscopy data for $x$ $\\approx$ 0.27 indicate a phase separation into Eu- and Ca-rich clusters of 5 to 10 nm diameter, leading to percolation-type phenomena in the electrical transport properties. The related critical concentration $x_p$ is approximately 0.3. For $x$ $\\approx$ 0.27, we observe colossal negative magnetoresistance effects at low temperatures, similar in magnitude as those reported for manganese oxides.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2004-04-23T12:06:41.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "colossal magnetoresistance",
      "eu-based hexaborides",
      "percolation",
      "colossal negative magnetoresistance effects",
      "electron microscopy data"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}