{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:4CJ2MO34OAPN6J27SWX5JTYN3N","short_pith_number":"pith:4CJ2MO34","canonical_record":{"source":{"id":"0705.1408","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2007-05-10T08:15:57Z","cross_cats_sorted":["cond-mat.supr-con"],"title_canon_sha256":"b6e99fcd69b2edf3b5165ac26cad22064864262249f0172889c4e221405a1420","abstract_canon_sha256":"98814e2966905045719f6a370a3161e1a65e006382c998d462466430683caa2b"},"schema_version":"1.0"},"canonical_sha256":"e093a63b7c701edf275f95afd4cf0ddb70128c757cd53e92b35f45961af0faf6","source":{"kind":"arxiv","id":"0705.1408","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0705.1408","created_at":"2026-05-18T04:27:03Z"},{"alias_kind":"arxiv_version","alias_value":"0705.1408v2","created_at":"2026-05-18T04:27:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0705.1408","created_at":"2026-05-18T04:27:03Z"},{"alias_kind":"pith_short_12","alias_value":"4CJ2MO34OAPN","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_16","alias_value":"4CJ2MO34OAPN6J27","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_8","alias_value":"4CJ2MO34","created_at":"2026-05-18T12:25:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:4CJ2MO34OAPN6J27SWX5JTYN3N","target":"record","payload":{"canonical_record":{"source":{"id":"0705.1408","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2007-05-10T08:15:57Z","cross_cats_sorted":["cond-mat.supr-con"],"title_canon_sha256":"b6e99fcd69b2edf3b5165ac26cad22064864262249f0172889c4e221405a1420","abstract_canon_sha256":"98814e2966905045719f6a370a3161e1a65e006382c998d462466430683caa2b"},"schema_version":"1.0"},"canonical_sha256":"e093a63b7c701edf275f95afd4cf0ddb70128c757cd53e92b35f45961af0faf6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:27:03.862216Z","signature_b64":"phAg7VpBNcTFZ6JYV7CcpsNRbR1Q8DVsZeh+v8evu+BwtjECJ+mhylnwe5HPKldA1EeChHrD/ACySgVmaYoXCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e093a63b7c701edf275f95afd4cf0ddb70128c757cd53e92b35f45961af0faf6","last_reissued_at":"2026-05-18T04:27:03.861558Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:27:03.861558Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0705.1408","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:27:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uUNrYmlm1fmHDPmkJtpX4Tsi4XEP2CFdyRxY8eZjnSMpbO1p6JARGFr9p60mkD91GzF/bzpalXbv8KEue5j0BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T20:01:39.731485Z"},"content_sha256":"19b17e25b1213aa2f3e0147fa532a5c5ee3d7e921e3c07becaf66b35ea133512","schema_version":"1.0","event_id":"sha256:19b17e25b1213aa2f3e0147fa532a5c5ee3d7e921e3c07becaf66b35ea133512"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:4CJ2MO34OAPN6J27SWX5JTYN3N","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Role of electronic correlations in the Fermi surface formation of Na$_x$CoO$_2$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.supr-con"],"primary_cat":"cond-mat.str-el","authors_text":"A.O. Shorikov, M.M. Korshunov, V.I. Anisimov","submitted_at":"2007-05-10T08:15:57Z","abstract_excerpt":"Band structure of metallic sodium cobaltate Na$_x$CoO$_2$ ($x$=0.33, 0.48, 0.61 0.72) has been investigated by local density approximation+Hubbard $U$ (LDA+$U$) method and within Gutzwiller approximation for the Co-$t_{2g}$ manifold. Correlation effects being taken into account results in suppression of the $e'_g$ hole pockets at the Fermi surface in agreement with recent angle-resolved photo-emission spectroscopy (ARPES) experiments. In the Gutzwiller approximation the bilayer splitting is significantly reduced due to the correlation effects. The formation of high spin (HS) state in Co $d$-sh"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0705.1408","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:27:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ll8ClAHpNYwrZOpGtlRPhBSspAMUSTvbdHyVG7WK1zdCocwH76WeEHGZAZmtM6Bh6HnycLXecMU6omHmoc7DCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T20:01:39.731841Z"},"content_sha256":"41dbb25567f27e0ff2ecf6cac4c4c21f6842beb2a146d7c16cecbfeffb704d03","schema_version":"1.0","event_id":"sha256:41dbb25567f27e0ff2ecf6cac4c4c21f6842beb2a146d7c16cecbfeffb704d03"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4CJ2MO34OAPN6J27SWX5JTYN3N/bundle.json","state_url":"https://pith.science/pith/4CJ2MO34OAPN6J27SWX5JTYN3N/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4CJ2MO34OAPN6J27SWX5JTYN3N/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T20:01:39Z","links":{"resolver":"https://pith.science/pith/4CJ2MO34OAPN6J27SWX5JTYN3N","bundle":"https://pith.science/pith/4CJ2MO34OAPN6J27SWX5JTYN3N/bundle.json","state":"https://pith.science/pith/4CJ2MO34OAPN6J27SWX5JTYN3N/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4CJ2MO34OAPN6J27SWX5JTYN3N/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:4CJ2MO34OAPN6J27SWX5JTYN3N","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":"98814e2966905045719f6a370a3161e1a65e006382c998d462466430683caa2b","cross_cats_sorted":["cond-mat.supr-con"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2007-05-10T08:15:57Z","title_canon_sha256":"b6e99fcd69b2edf3b5165ac26cad22064864262249f0172889c4e221405a1420"},"schema_version":"1.0","source":{"id":"0705.1408","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0705.1408","created_at":"2026-05-18T04:27:03Z"},{"alias_kind":"arxiv_version","alias_value":"0705.1408v2","created_at":"2026-05-18T04:27:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0705.1408","created_at":"2026-05-18T04:27:03Z"},{"alias_kind":"pith_short_12","alias_value":"4CJ2MO34OAPN","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_16","alias_value":"4CJ2MO34OAPN6J27","created_at":"2026-05-18T12:25:54Z"},{"alias_kind":"pith_short_8","alias_value":"4CJ2MO34","created_at":"2026-05-18T12:25:54Z"}],"graph_snapshots":[{"event_id":"sha256:41dbb25567f27e0ff2ecf6cac4c4c21f6842beb2a146d7c16cecbfeffb704d03","target":"graph","created_at":"2026-05-18T04:27:03Z","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":"Band structure of metallic sodium cobaltate Na$_x$CoO$_2$ ($x$=0.33, 0.48, 0.61 0.72) has been investigated by local density approximation+Hubbard $U$ (LDA+$U$) method and within Gutzwiller approximation for the Co-$t_{2g}$ manifold. Correlation effects being taken into account results in suppression of the $e'_g$ hole pockets at the Fermi surface in agreement with recent angle-resolved photo-emission spectroscopy (ARPES) experiments. In the Gutzwiller approximation the bilayer splitting is significantly reduced due to the correlation effects. The formation of high spin (HS) state in Co $d$-sh","authors_text":"A.O. Shorikov, M.M. Korshunov, V.I. Anisimov","cross_cats":["cond-mat.supr-con"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2007-05-10T08:15:57Z","title":"Role of electronic correlations in the Fermi surface formation of Na$_x$CoO$_2$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0705.1408","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":"sha256:19b17e25b1213aa2f3e0147fa532a5c5ee3d7e921e3c07becaf66b35ea133512","target":"record","created_at":"2026-05-18T04:27:03Z","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":"98814e2966905045719f6a370a3161e1a65e006382c998d462466430683caa2b","cross_cats_sorted":["cond-mat.supr-con"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2007-05-10T08:15:57Z","title_canon_sha256":"b6e99fcd69b2edf3b5165ac26cad22064864262249f0172889c4e221405a1420"},"schema_version":"1.0","source":{"id":"0705.1408","kind":"arxiv","version":2}},"canonical_sha256":"e093a63b7c701edf275f95afd4cf0ddb70128c757cd53e92b35f45961af0faf6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e093a63b7c701edf275f95afd4cf0ddb70128c757cd53e92b35f45961af0faf6","first_computed_at":"2026-05-18T04:27:03.861558Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:27:03.861558Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"phAg7VpBNcTFZ6JYV7CcpsNRbR1Q8DVsZeh+v8evu+BwtjECJ+mhylnwe5HPKldA1EeChHrD/ACySgVmaYoXCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:27:03.862216Z","signed_message":"canonical_sha256_bytes"},"source_id":"0705.1408","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:19b17e25b1213aa2f3e0147fa532a5c5ee3d7e921e3c07becaf66b35ea133512","sha256:41dbb25567f27e0ff2ecf6cac4c4c21f6842beb2a146d7c16cecbfeffb704d03"],"state_sha256":"2864d6d76a06c98c22884feaf4931348b89060b6c8debc892ed3ae3d98c7d425"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AX+qT73Ml1igpfBTIxNvH5165N/PZTvkqSrl9dOvc3yzF9FDgfMehlWeeuLXIO3I0xLLykXUbE4GbnAG1pesCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T20:01:39.733820Z","bundle_sha256":"7825a0f42b1a7f06a3dde06fc6eda9b93e33cd365a4f1daa3fb7c43ab3f035e3"}}