{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:CUMYEZ3ZMQCSJHAX5L763NX6XM","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":"bf79944335882c5d3757afae1e853361f7dd05f347ba66f8e6de9364bfc24b9c","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-01-10T13:28:45Z","title_canon_sha256":"c9890a5671598d809689a7a5aab33dc9962c1c4f40a6d2b56247280892f6cc06"},"schema_version":"1.0","source":{"id":"1001.1508","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1001.1508","created_at":"2026-05-18T02:10:03Z"},{"alias_kind":"arxiv_version","alias_value":"1001.1508v1","created_at":"2026-05-18T02:10:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1001.1508","created_at":"2026-05-18T02:10:03Z"},{"alias_kind":"pith_short_12","alias_value":"CUMYEZ3ZMQCS","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_16","alias_value":"CUMYEZ3ZMQCSJHAX","created_at":"2026-05-18T12:26:06Z"},{"alias_kind":"pith_short_8","alias_value":"CUMYEZ3Z","created_at":"2026-05-18T12:26:06Z"}],"graph_snapshots":[{"event_id":"sha256:b854945587635a5be7c977d7972175662b248a6b18ddc871f171e59136bdcbc9","target":"graph","created_at":"2026-05-18T02:10:03Z","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":"Shubnikov-de Haas and de Haas-van Alphen effects have been measured in the underdoped high temperature superconductor YBa$_2$Cu$_3$O$_{6.51}$. Data are in agreement with the standard Lifshitz-Kosevitch theory, which confirms the presence of a coherent Fermi surface in the ground state of underdoped cuprates. A low frequency $F = 530 \\pm 10$ T is reported in both measurements, pointing to small Fermi pocket, which corresponds to 2% of the first Brillouin zone area only. This low value is in sharp contrast with that of overdoped Tl$_2$Ba$_2$CuO$_{6+\\delta}$, where a high frequency $F = 18$ kT ha","authors_text":"Alain Audouard, Baptiste Vignolle, Cyril Jaudet, Cyril Proust, D.A. Bonn, David Vignolles, Julien Levallois, Louis Taillefer, N.E. Hussey, Ruixing Liang, W.N. Hardy","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-01-10T13:28:45Z","title":"Quantum oscillations in underdoped YBa_2Cu_3O_6.5"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1001.1508","kind":"arxiv","version":1},"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":"sha256:7bbfd28a0f68b22b6597734f76410e13c4d813bead6a97b5b17be002368195f9","target":"record","created_at":"2026-05-18T02:10:03Z","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":"bf79944335882c5d3757afae1e853361f7dd05f347ba66f8e6de9364bfc24b9c","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2010-01-10T13:28:45Z","title_canon_sha256":"c9890a5671598d809689a7a5aab33dc9962c1c4f40a6d2b56247280892f6cc06"},"schema_version":"1.0","source":{"id":"1001.1508","kind":"arxiv","version":1}},"canonical_sha256":"15198267796405249c17eaffedb6febb084c4aee17ab8667f4fffe906529ad8c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"15198267796405249c17eaffedb6febb084c4aee17ab8667f4fffe906529ad8c","first_computed_at":"2026-05-18T02:10:03.377390Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:10:03.377390Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vCHdNIalZkNFybB4eyCWiwLuWbcB0Ct8sd929wNr4PAZBj9u3w1XHmfwTlWDEYm0rXjKTvx432Ko2veBs3aTDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:10:03.377838Z","signed_message":"canonical_sha256_bytes"},"source_id":"1001.1508","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7bbfd28a0f68b22b6597734f76410e13c4d813bead6a97b5b17be002368195f9","sha256:b854945587635a5be7c977d7972175662b248a6b18ddc871f171e59136bdcbc9"],"state_sha256":"5ed5c222932ad395de59d54d2137662c73ddc981f30709078050e1522c8491d4"}