{
  "version": "materials-source-reference-pilot/1.0.0",
  "prepared_on": "2026-10-02",
  "boundary": {
    "description": "Seven paper items and three independent crystallographic references, inspected with AI assistance. Sample and state matching to catalogue results remains pending; these items are not independent experiments.",
    "association": "No physical sample, phase, state or retained-result association established; no association IDs assigned.",
    "source_access": "Official original URLs and downloadable factual metadata; no fulltext rehosting.",
    "eligibility_snapshot": {
      "site_version": "761bbc9",
      "dataset_version": "v2026.09.03",
      "observed_at_utc": "2026-10-01T21:00:16.129692+00:00",
      "CrB2": "catalogue eligible in that snapshot",
      "MgB2_and_FeSe": "disputed/archive-only in that snapshot",
      "current_release_recheck_required": true,
      "external_references_do_not_bypass_holds": true
    },
    "unknown_conditions": "Unknown pressure is not ambient; structure temperature/pressure are not Tc conditions.",
    "scientific_acceptance": false,
    "formal_human_review": false,
    "canonical_promotions": 0,
    "application_seed_added": false,
    "database_changed": false,
    "publication_and_currentness": "The current publication status and source lifecycle of each work have not been established for this pilot. Historical catalogue eligibility is not a current source clearance."
  },
  "paper_source": {
    "title": "Pressure-induced superconductivity in itinerant antiferromagnet CrB2",
    "url": "https://arxiv.org/pdf/2109.15213v1",
    "requested_arxiv_version": "v1",
    "pdf_sha256": "036b3c1cb653ee142f202a5b68c54230753621aaf31dfcfd60ea1f4447f1ea03",
    "bytes": 770583,
    "AI_source_scope_checked_at_utc": "2026-10-01T21:00:58.366286+00:00",
    "publication_revision_verified": false,
    "anchor_coordinate_system": "Unicode Python characters in captured pdftotext -layout page; not PDF geometry",
    "PDF_or_fulltext_rehosted": false
  },
  "paper_findings": [
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      "id": "crb2-summary-tc-pressure",
      "label": "Rounded summary Tc",
      "display_value": "7 K at approximately 100 GPa",
      "origin": "Experimental report · rounded summary",
      "scope": "Summary on PDF page 3. Kept separate from the detailed transport result.",
      "unresolved": "Catalogue result and sample matching pending.",
      "pages": [
        3
      ],
      "quantities": [
        {
          "value": 7,
          "unit": "K",
          "relation": "rounded_summary",
          "role": "Tc source report",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "7"
        },
        {
          "value": 100,
          "unit": "GPa",
          "relation": "approximate",
          "role": "Pressure paired in this source statement",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "100"
        }
      ],
      "source_fields": {
        "tc": {
          "value": 7,
          "unit": "K",
          "relation": "rounded_summary"
        },
        "pressure": {
          "value": 100,
          "unit": "GPa",
          "relation": "approximate"
        }
      },
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      "sample_identity_established": false,
      "phase_identity_established": false,
      "selected_result_association": "unestablished"
    },
    {
      "id": "crb2-detailed-tc-pressure",
      "label": "Detailed transport Tc",
      "display_value": "Approximately 7.3 K at 110.4 GPa",
      "origin": "Experimental transport report",
      "scope": "Transport result on PDF page 4.",
      "unresolved": "Catalogue result, sample and curve matching pending.",
      "pages": [
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      ],
      "quantities": [
        {
          "value": 7.3,
          "unit": "K",
          "relation": "approximately",
          "role": "Tc source report",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "7.3"
        },
        {
          "value": 110.4,
          "unit": "GPa",
          "relation": "reported_measurement_pressure",
          "role": "Pressure paired in this source statement",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "110.4"
        }
      ],
      "source_fields": {
        "tc": {
          "value": 7.3,
          "unit": "K",
          "relation": "approximately"
        },
        "pressure": {
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          "unit": "GPa",
          "relation": "reported_measurement_pressure"
        },
        "knowledge_origin": "Observed"
      },
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    },
    {
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      "label": "High-pressure measurement method",
      "display_value": "DC resistivity · van der Pauw · DAC / PPMS",
      "origin": "Experimental method description",
      "scope": "Reported above 12 GPa; ruby pressure calibration at room temperature.",
      "unresolved": "Below 12 GPa, the source describes a separate CAC four-probe protocol.",
      "pages": [
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      ],
      "quantities": [
        {
          "value": 12,
          "unit": "GPa",
          "relation": "apparatus-domain-boundary",
          "role": "Threshold between described apparatus branches; not a Tc pressure",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "12"
        }
      ],
      "source_fields": {
        "method": "dc resistivity, van der Pauw, PPMS, nonmagnetic DAC",
        "applicability": "reported experiments above12GPa",
        "pressure_calibration": "ruby scale at room temperature",
        "low_pressure_branch": {
          "apparatus": "CAC",
          "method": "four-probe",
          "pressure_scope": "below12GPa"
        },
        "pressure_calibration_temperature_is_Tc_temperature": false
      },
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      "sample_identity_established": false,
      "phase_identity_established": false,
      "selected_result_association": "unestablished"
    },
    {
      "id": "crb2-tc-criterion",
      "label": "Transition criterion",
      "display_value": "90% of normal-state resistivity",
      "origin": "Figure-specific definition",
      "scope": "Figure 2 caption on PDF page 8; associated upper-critical-field curve context on page 5.",
      "unresolved": "Applicability to individual catalogue results remains unresolved.",
      "pages": [
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      ],
      "quantities": [
        {
          "value": 90,
          "unit": "%",
          "relation": "definition",
          "role": "Figure2 normal-state resistivity criterion; not another Tc value",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "90"
        }
      ],
      "source_fields": {
        "criterion": "90% of normal-state resistivity",
        "source_scope": "Figure2 transition temperatures, with explicit caption and Hc2 curve context"
      },
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      "sample_identity_established": false,
      "phase_identity_established": false,
      "selected_result_association": "unestablished"
    },
    {
      "id": "crb2-derived-hc2",
      "label": "Upper critical field, μ₀Hc2(0)",
      "display_value": "5.81 T at 110.4 GPa",
      "origin": "Derived from a GL fit to transport",
      "scope": "Zero-temperature extrapolation on PDF page 5. Figure 2d rounds the same fit to 5.8 T.",
      "unresolved": "This is a fitted quantity; result and sample matching pending.",
      "pages": [
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      ],
      "quantities": [
        {
          "value": 5.81,
          "unit": "T",
          "relation": "derived",
          "role": "GL fit/extrapolation",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "5.81"
        },
        {
          "value": 110.4,
          "unit": "GPa",
          "relation": "reported_measurement_pressure",
          "role": "Pressure of transport-derived fit scope",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "110.4"
        },
        {
          "value": 5.8,
          "unit": "T",
          "relation": "rounded_same_fit",
          "role": "Figure2d label; not independent measurement",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "5.8"
        }
      ],
      "source_fields": {
        "quantity": "mu0Hc2(0)",
        "value": 5.81,
        "unit": "T",
        "pressure_gpa": 110.4,
        "temperature_role": "zero-temperature extrapolation",
        "derivation": "empirical Ginzburg-Landau fit",
        "criterion": "90% normal-state resistivity",
        "scientific_role": "derived_from_experimental_transport",
        "same_fit_figure_rounding": {
          "value": 5.8,
          "unit": "T",
          "figure": "2d",
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      },
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      "depends_on": [
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      "reference_status": "pending",
      "scientific_acceptance": false,
      "material_state_reviewed": false,
      "sample_identity_established": false,
      "phase_identity_established": false,
      "selected_result_association": "unestablished"
    },
    {
      "id": "crb2-derived-coherence-length",
      "label": "Coherence length, ξ_GL(0)",
      "display_value": "7.54 nm at 110.4 GPa",
      "origin": "Derived from fitted Hc2(0)",
      "scope": "Reported on PDF page 5; depends on the fitted upper critical field.",
      "unresolved": "Result and sample matching pending.",
      "pages": [
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      "quantities": [
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          "role": "Derived from fitted Hc2(0)",
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          "uncertainty_status": "not_supplied",
          "raw": "7.54"
        },
        {
          "value": 110.4,
          "unit": "GPa",
          "relation": "reported_measurement_pressure",
          "role": "Pressure of transport-derived fit scope",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "110.4"
        }
      ],
      "source_fields": {
        "quantity": "xi_GL(0)",
        "value": 7.54,
        "unit": "nm",
        "pressure_gpa": 110.4,
        "derivation": "Ginzburg-Landau quantity derived from fitted Hc2(0)",
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      "phase_identity_established": false,
      "selected_result_association": "unestablished"
    },
    {
      "id": "crb2-reported-structure-label",
      "label": "Reported structure description",
      "display_value": "AlB₂ type · P6/mmm",
      "origin": "Source structure description",
      "scope": "Ambient-pressure description; separate room-temperature XRD discussion extends to 97.2 GPa.",
      "unresolved": "Coordinates at 110.4 GPa and association with the COD reference remain unestablished.",
      "pages": [
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      ],
      "quantities": [
        {
          "value": 97.2,
          "unit": "GPa",
          "relation": "upper_pressure_studied",
          "role": "Separate powder XRD scope; not Tc or CIF reference pressure",
          "standard_uncertainty": null,
          "uncertainty_status": "not_supplied",
          "raw": "97.2"
        }
      ],
      "source_fields": {
        "space_group": "P6/mmm",
        "structure_type": "AlB2 type",
        "source_scope": "ambient-pressure description; room-temperature XRD trend studied separately up to97.2GPa"
      },
      "anchors_without_raw_quote": [
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    }
  ],
  "structure_references": [
    {
      "id": "cod-1510641",
      "formula": "CrB2",
      "cod_id": "1510641",
      "declared_formula": "B2 Cr",
      "cell_content_formula": "- B2 Cr -",
      "declared_space_group": "P 6/m m m",
      "declared_space_group_number": 191,
      "declared_hall_symbol": "-P 6 2",
      "lattice": {
        "a": {
          "raw": "2.97",
          "value": 2.97,
          "unit": "Å",
          "standard_uncertainty": null,
          "uncertainty_status": "not_reported",
          "CIF_tag": "_cell_length_a",
          "CIF_line_1_based": 38
        },
        "b": {
          "raw": "2.97",
          "value": 2.97,
          "unit": "Å",
          "standard_uncertainty": null,
          "uncertainty_status": "not_reported",
          "CIF_tag": "_cell_length_b",
          "CIF_line_1_based": 39
        },
        "c": {
          "raw": "3.07",
          "value": 3.07,
          "unit": "Å",
          "standard_uncertainty": null,
          "uncertainty_status": "not_reported",
          "CIF_tag": "_cell_length_c",
          "CIF_line_1_based": 40
        },
        "alpha": {
          "raw": "90",
          "value": 90.0,
          "unit": "degrees",
          "standard_uncertainty": null,
          "uncertainty_status": "not_reported",
          "CIF_tag": "_cell_angle_alpha",
          "CIF_line_1_based": 34
        },
        "beta": {
          "raw": "90",
          "value": 90.0,
          "unit": "degrees",
          "standard_uncertainty": null,
          "uncertainty_status": "not_reported",
          "CIF_tag": "_cell_angle_beta",
          "CIF_line_1_based": 35
        },
        "gamma": {
          "raw": "120",
          "value": 120.0,
          "unit": "degrees",
          "standard_uncertainty": null,
          "uncertainty_status": "not_reported",
          "CIF_tag": "_cell_angle_gamma",
          "CIF_line_1_based": 36
        }
      },
      "temperature_k": null,
      "pressure_gpa": null,
      "temperature_scope": "Structure measurement temperature not supplied",
      "structure_conditions": {
        "celltemp": {
          "raw": null,
          "value": null,
          "standard_uncertainty": null,
          "unit": "K",
          "status": "not_supplied",
          "source_tag": "_cell_measurement_temperature",
          "source_line": null
        },
        "diffrtemp": {
          "raw": null,
          "value": null,
          "standard_uncertainty": null,
          "unit": "K",
          "status": "not_supplied",
          "source_tag": "_diffrn_ambient_temperature",
          "source_line": null
        },
        "cellpressure": {
          "raw": null,
          "value": null,
          "standard_uncertainty": null,
          "unit": "kPa",
          "status": "not_supplied",
          "source_tag": "_cell_measurement_pressure",
          "source_line": null
        },
        "diffrpressure": {
          "raw": null,
          "value": null,
          "standard_uncertainty": null,
          "unit": "kPa",
          "status": "not_supplied",
          "source_tag": "_diffrn_ambient_pressure",
          "source_line": null
        }
      },
      "Fe_site_occupancy": null,
      "source": {
        "entry_url": "https://www.crystallography.net/cod/1510641.html",
        "cif_url": "https://www.crystallography.net/cod/1510641.cif@176435",
        "captured_revision": 176435,
        "version_url_succeeded_at_capture": true,
        "file_sha256": "bdd1e9169c057b3b0b2e5b16c96d7cde1427c04aaf3668f858ca8b06fc9e67ec",
        "bytes": 2071,
        "year": 1954,
        "doi": "10.1016/0001-6160(54)90090-5",
        "bibliography": {
          "authors": "Moskowitz, D.; Glaser, F.W.; Post, B.",
          "title": "Transition metal diborides",
          "journal": "Acta Metallurgica",
          "year": "1954",
          "volume": "2",
          "firstpage": "20",
          "lastpage": "25",
          "doi": "10.1016/0001-6160(54)90090-5",
          "CIF_doi": "10.1016/0001-6160(54)90090-5",
          "COD_method": null,
          "CIF_radiation_probe": null
        },
        "captured_at_utc": "2026-10-01T20:39:12.139572+00:00",
        "captured_HTTP_status": 200,
        "license": "CC0-1.0",
        "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
        "license_basis": "Each already-captured official COD entry links to CC0 /publicdomain/zero/1.0/; the CIF header states public domain.",
        "download_is_mutable_current_file": false,
        "publication_revision_verified": false
      },
      "checks": {
        "parser": "Gemmi0.7.5, isolated task runtime",
        "CIF_syntax_and_listed_site_coordinates_checked": true,
        "declared_operations_and_metric_checked": true,
        "independent_space_group_inference": false,
        "checkCIF_or_refinement_performed": false,
        "listed_site_count": 2,
        "rounding_scope": [
          "Rounded boron coordinates produce precision-sensitive symmetry-equivalent near-images. The 0.001 Å deduplication check agrees with B2; original coordinates were not changed."
        ]
      },
      "limitations": [
        "Physical sample, phase and catalogue result matching remain pending.",
        "Pressure is not supplied in this CIF.",
        "Temperature is not supplied in this CIF."
      ],
      "reference_status": "pending",
      "scientific_acceptance": false,
      "material_state_reviewed": false,
      "coordinate_model_validated": false,
      "sample_identity_established": false,
      "phase_identity_established": false,
      "selected_result_association": "unestablished"
    },
    {
      "id": "cod-1526507",
      "formula": "MgB2",
      "cod_id": "1526507",
      "declared_formula": "B2 Mg",
      "cell_content_formula": "- B2 Mg -",
      "declared_space_group": "P 6/m m m",
      "declared_space_group_number": 191,
      "declared_hall_symbol": "-P 6 2",
      "lattice": {
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