{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:OKP27V3F6OT5YF2WLIBHDEVWA7","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"837e8540caa280a9dcfc912caef3babe174b83d0312f34e88966909752295906","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2010-09-16T21:12:40Z","title_canon_sha256":"7853a6e3b8db840fabf7c64ef448a77b810a949b4e41c57c4eac1feb8ea8aa08"},"schema_version":"1.0","source":{"id":"1009.3287","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.3287","created_at":"2026-05-18T04:26:02Z"},{"alias_kind":"arxiv_version","alias_value":"1009.3287v2","created_at":"2026-05-18T04:26:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.3287","created_at":"2026-05-18T04:26:02Z"},{"alias_kind":"pith_short_12","alias_value":"OKP27V3F6OT5","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"OKP27V3F6OT5YF2W","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"OKP27V3F","created_at":"2026-05-18T12:26:12Z"}],"graph_snapshots":[{"event_id":"sha256:6c610191411a0cc78bfd53a6ad81680038eef50dc1d2f95b217038a0c2577ea7","target":"graph","created_at":"2026-05-18T04:26:02Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We apply density functional theory band structure calculations, the coupled-cluster method, and exact diagonalization to investigate the microscopic magnetic model of the spin-1/2 compound Cu2GeO4. The model is quasi-two-dimensional, with uniform spin chains along one direction and frustrated spin chains along the other direction. The coupling along the uniform chains is antiferromagnetic, J 130 K. The couplings along the frustrated chains are J1 -60 K and J2 80 K between nearest neighbors and next-nearest neighbors, respectively. The ground state of the quantum model is a spiral, with the red","authors_text":"Alexander A. Tsirlin, Helge Rosner, Johannes Richter, Ronald Zinke","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2010-09-16T21:12:40Z","title":"Spiral ground state in the quasi-two-dimensional spin-1/2 system Cu2GeO4"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.3287","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:695ea056639fb415e6338f42c7aa19782ebdfb813ead70ec5692e807168848ca","target":"record","created_at":"2026-05-18T04:26:02Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"837e8540caa280a9dcfc912caef3babe174b83d0312f34e88966909752295906","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2010-09-16T21:12:40Z","title_canon_sha256":"7853a6e3b8db840fabf7c64ef448a77b810a949b4e41c57c4eac1feb8ea8aa08"},"schema_version":"1.0","source":{"id":"1009.3287","kind":"arxiv","version":2}},"canonical_sha256":"729fafd765f3a7dc17565a027192b607e314825e73c2e9bd43ffd9a5a14ecc5f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"729fafd765f3a7dc17565a027192b607e314825e73c2e9bd43ffd9a5a14ecc5f","first_computed_at":"2026-05-18T04:26:02.369784Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:26:02.369784Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GAzfq6uhnmzIcenwidqZZOILuzejLkvwORERF1Uvo7wYjRq0TZw/j5UKM4Hk2+SuuRAkkGFhdRfD9mcx5/pyAg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:26:02.370228Z","signed_message":"canonical_sha256_bytes"},"source_id":"1009.3287","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:695ea056639fb415e6338f42c7aa19782ebdfb813ead70ec5692e807168848ca","sha256:6c610191411a0cc78bfd53a6ad81680038eef50dc1d2f95b217038a0c2577ea7"],"state_sha256":"88ab7213946bcb3a50c3855e882d359e1c616e229a99a14fd16653a6f4ed4962"}