{
  "id": "1903.00002",
  "version": "v1",
  "published": "2019-02-28T18:59:50.000Z",
  "updated": "2019-02-28T18:59:50.000Z",
  "title": "Giant enhancement of interlayer exchange in an ultrathin 2D magnet",
  "authors": [
    "Dahlia R. Klein",
    "David MacNeill",
    "Qian Song",
    "Daniel T. Larson",
    "Shiang Fang",
    "Mingyu Xu",
    "R. A. Ribeiro",
    "Paul C. Canfield",
    "Efthimios Kaxiras",
    "Riccardo Comin",
    "Pablo Jarillo-Herrero"
  ],
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "Following the recent isolation of monolayer CrI3, there has been a surge of new two-dimensional van der Waals magnetic materials, whose incorporation in van der Waals heterostructures offers a new platform for spintronics, proximity magnetism, and quantum spin liquids. A primary question in this burgeoning field is how exfoliating crystals to the few-layer limit influences their magnetism. Studies on CrI3 have shown a different magnetic ground state for ultrathin exfoliated films but the origin is not yet understood. Here, we use electron tunneling through few-layer crystals of the layered antiferromagnetic insulator CrCl3 to probe its magnetic order, finding a ten-fold enhancement in the interlayer exchange compared to bulk crystals. Moreover, temperature- and polarization-dependent Raman spectroscopy reveal that the crystallographic phase transition of bulk crystals does not occur in exfoliated films. This results in a different low temperature stacking order and, we hypothesize, increased interlayer exchange. Our study provides new insight into the connection between stacking order and interlayer interactions in novel two-dimensional magnets, which may be relevant for correlating stacking faults and mechanical deformations with the magnetic ground states of other more exotic layered magnets, such as RuCl3.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-02-28T18:59:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ultrathin 2d magnet",
      "interlayer exchange",
      "giant enhancement",
      "magnetic ground state",
      "van der waals heterostructures offers"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}