{
  "annotation_id": "1b4cdfe9-6298-4b22-8159-1a68c8781f08",
  "date_created": "2026-03-02T18:01:14.084000Z",
  "date_modified": "2026-03-02T18:01:14.084000Z",
  "file_hash": "5c05fe76f2d3dde8a0becfe41dd2c891eb7364d6211e57536470999da2be06e4",
  "private": false,
  "record": {
    "abstract": "It is shown that the contribution to the induction which at an internal point\nof a spin density distribution is mathematically described as a local is\nvirtually caused by the summing-up of the fields created by all elements of\nthis distribution. Therefore, the proportionality coefficient between this\ncontact (Fermi) field and magnetic moment density at the point of observation\nis equal to 8pi/3 only for spherically symmetrical s-shells. If the symmetry of\nspin density distribution lowers, the value of this coefficient becomes\ndependent on the spin direction. As a sequence, in low-symmetry crystals and\nmolecules additional anisotropic contributions to the hyperfine field emerge.",
    "arxiv_id": "physics/0610060",
    "authors": [
      "E. V. Rosenfeld"
    ],
    "categories": [
      "physics.atm-clus",
      "physics.gen-ph"
    ],
    "title": "Is the Fermi field contact and isotropic?",
    "url": "https://arxiv.org/abs/physics/0610060"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "90db1884-9855-47dd-bb61-1b4515820cf2",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}