{
 "note": "Reference problems, not live listings. Live problems come from GET /v1/problems at launch with the same envelope. Fields that are null are set by the operator at posting and are not decided yet.",
 "generated_by": "scripts/reference_systems.py --json",
 "bounty_rule": "reserve_price_usd = 0.9 x reference_solve.solve_usd, where the reference solve preconditions in a cheap local-orbital basis and finishes in QE; qe_steps is the estimated plane-wave SCF step count of that finish",
 "events": [
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    "title": "Bulk MgO - rocksalt SCF",
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     "insulator"
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    "constraints": null,
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   "event": "problem.reference",
   "seq": "fe",
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    "title": "Bulk Fe - ferromagnetic relax",
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     "compchem",
     "metal",
     "magnetic"
    ],
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    "state": "reference",
    "engine": "qe",
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    "composition": {
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    "constraints": null,
    "quality_floor": null,
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   "seq": "sto_vac",
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     "defect",
     "perovskite"
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    "state": "reference",
    "engine": "siesta",
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    "composition": {
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     "Ti": 27,
     "O": 80
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    "spin": "none",
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    "hubbard": false,
    "constraints": "outer shell fixed",
    "quality_floor": null,
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   }
  },
  {
   "event": "problem.reference",
   "seq": "nio",
   "data": {
    "id": "nio",
    "title": "NiO - noncollinear + SOC + U single point",
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     "soc"
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    "state": "reference",
    "engine": "qe",
    "fidelity": "highly_conservative",
    "composition": {
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     "O": 32
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    "soc": true,
    "hubbard": true,
    "constraints": null,
    "quality_floor": null,
    "allowMoreAccurate": true,
    "reserve_price_usd": 1.503,
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    "closes_at": null,
    "open_window_days": 14,
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    "frozen_spec_sha256": null,
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     "reference_solve": {
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   }
  },
  {
   "event": "problem.reference",
   "seq": "co_slab",
   "data": {
    "id": "co_slab",
    "title": "Co(110) slab - in-plane relax, z fixed",
    "tags": [
     "compchem",
     "slab",
     "magnetic",
     "soc"
    ],
    "mode": "relax",
    "state": "reference",
    "engine": "qe",
    "fidelity": "reasonable",
    "composition": {
     "Co": 63
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    "cell_lengths_A": [
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     10.632,
     19.518
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    "spin": "noncollinear",
    "soc": true,
    "hubbard": false,
    "constraints": "z fixed, relax x and y",
    "quality_floor": null,
    "allowMoreAccurate": true,
    "reserve_price_usd": 9.531,
    "deposit_usd": 0.0,
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    "open_window_days": 10,
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    }
   }
  },
  {
   "event": "problem.reference",
   "seq": "mtj",
   "data": {
    "id": "mtj",
    "title": "Fe/MgO/Fe MTJ - antiparallel state",
    "tags": [
     "heterostructure",
     "magnetic",
     "spintronics"
    ],
    "mode": "scf",
    "state": "reference",
    "engine": "siesta",
    "fidelity": "conservative",
    "composition": {
     "Fe": 48,
     "Mg": 20,
     "O": 20
    },
    "cell_lengths_A": [
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     5.73,
     28.6
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    "spin": "collinear",
    "soc": false,
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    "constraints": null,
    "quality_floor": null,
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    "reserve_price_usd": 1.605,
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    "protocol_semver": null,
    "frozen_spec_sha256": null,
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     "dk_inv_A": 0.03,
     "witness_check_usd": 0.0212,
     "cold_audit_usd": 0.4191,
     "reference_solve": {
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      "solve_usd": 1.7828,
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    }
   }
  },
  {
   "event": "problem.reference",
   "seq": "succinic",
   "data": {
    "id": "succinic",
    "title": "Succinic acid crystal - molecular relax",
    "tags": [
     "organic",
     "molecular-crystal",
     "vdw"
    ],
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    "state": "reference",
    "engine": "siesta",
    "fidelity": "reasonable",
    "composition": {
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    "cell_lengths_A": [
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   }
  },
  {
   "event": "problem.reference",
   "seq": "co_pt111",
   "data": {
    "id": "co_pt111",
    "title": "CO on Pt(111) - adsorption geometry",
    "tags": [
     "surface",
     "catalysis",
     "metal"
    ],
    "mode": "relax",
    "state": "reference",
    "engine": "qe",
    "fidelity": "conservative",
    "composition": {
     "Pt": 36,
     "C": 1,
     "O": 1
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    "cell_lengths_A": [
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     20.79
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    "soc": false,
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    "reserve_price_usd": 0.082,
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   }
  },
  {
   "event": "problem.reference",
   "seq": "polyethylene",
   "data": {
    "id": "polyethylene",
    "title": "Polyethylene chain - 1D periodic relax",
    "tags": [
     "organic",
     "polymer",
     "vdw"
    ],
    "mode": "relax",
    "state": "reference",
    "engine": "siesta",
    "fidelity": "reasonable",
    "composition": {
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   }
  },
  {
   "event": "problem.reference",
   "seq": "au_mos2_au",
   "data": {
    "id": "au_mos2_au",
    "title": "Au/MoS2/Au memristor - Au in the S vacancy",
    "tags": [
     "heterostructure",
     "memristor",
     "2d"
    ],
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    "state": "reference",
    "engine": "siesta",
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    "composition": {
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     "Mo": 3,
     "S": 5
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     29.22
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 ],
 "next_cursor": null
}