{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:7D2DVNQP64T3KKTIJ2ABDWZSZ3","short_pith_number":"pith:7D2DVNQP","canonical_record":{"source":{"id":"1103.3646","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-03-18T15:05:36Z","cross_cats_sorted":[],"title_canon_sha256":"4ab142935acc84b9f0055bfc4c2272acb151949795625a9944223cc0613fa11e","abstract_canon_sha256":"d7d88c61c8dae684cd63b59f2a9812be2d038e9338e6732f61c44b10fcc310a4"},"schema_version":"1.0"},"canonical_sha256":"f8f43ab60ff727b52a684e8011db32cee79f75907cdad4c34996a0d6605b3dfe","source":{"kind":"arxiv","id":"1103.3646","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.3646","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"arxiv_version","alias_value":"1103.3646v1","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.3646","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"pith_short_12","alias_value":"7D2DVNQP64T3","created_at":"2026-05-18T12:26:22Z"},{"alias_kind":"pith_short_16","alias_value":"7D2DVNQP64T3KKTI","created_at":"2026-05-18T12:26:22Z"},{"alias_kind":"pith_short_8","alias_value":"7D2DVNQP","created_at":"2026-05-18T12:26:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:7D2DVNQP64T3KKTIJ2ABDWZSZ3","target":"record","payload":{"canonical_record":{"source":{"id":"1103.3646","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-03-18T15:05:36Z","cross_cats_sorted":[],"title_canon_sha256":"4ab142935acc84b9f0055bfc4c2272acb151949795625a9944223cc0613fa11e","abstract_canon_sha256":"d7d88c61c8dae684cd63b59f2a9812be2d038e9338e6732f61c44b10fcc310a4"},"schema_version":"1.0"},"canonical_sha256":"f8f43ab60ff727b52a684e8011db32cee79f75907cdad4c34996a0d6605b3dfe","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:02:49.742112Z","signature_b64":"M6COR2zlJnnQvLbEvyljAGMkHk/PIKc8Ia7zm6kqEdz6+o3dJGyofbnDxBxEWT5PkvBvjgz2i4MO4OHcKNInCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f8f43ab60ff727b52a684e8011db32cee79f75907cdad4c34996a0d6605b3dfe","last_reissued_at":"2026-05-18T02:02:49.741503Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:02:49.741503Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1103.3646","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:02:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T6TT2d1bn+7mD56pC0VIC1+fKMnhtIsNi0UhgwssPuLPjU1DeTeZKlpEyeHP3soB/rynG5qU2zDIX3z80sySAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T05:35:32.549428Z"},"content_sha256":"3615fa98c5ff571c75ddaa875771256969f61c2e3f6e3c26d9eded1245fa60f1","schema_version":"1.0","event_id":"sha256:3615fa98c5ff571c75ddaa875771256969f61c2e3f6e3c26d9eded1245fa60f1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:7D2DVNQP64T3KKTIJ2ABDWZSZ3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observation of a valence transition in (Pr,Ca)CoO3 cobaltites: charge migration at the metal-insulator transition","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Aura J. Bar\\'on-Gonz\\'alez, Carlos Frontera, Esther Dudzik, Florin Radu, Javier Blasco, Jos\\'e Luis Garc\\'ia-Mu\\~noz, Radu Abrudan, Ralf Feyerherm, Sergio Valencia","submitted_at":"2011-03-18T15:05:36Z","abstract_excerpt":"X-ray absorption spectroscopy measurements in Pr0.5Ca0.5CoO3 and (Pr,Y)0.55Ca0.45CoO3 compositions reveal that the valence of praseodymium ions is stable and essentially +3 (Pr [4f 2]) in the metallic state, but abruptly changes when carriers localize approaching the oxidation state +4 (Pr [4f 1]). This mechanism appears to be the driving force of the metal-insulator transition. The ground insulating state of Pr0.5Ca0.5CoO3 is an homogeneous Co3.5-d state stabilized by a charge transfer from Pr to Co sites: 1/2Pr3+ + Co3.5 \\to 1/2Pr3+2d + Co3.5-d, with 2d \\approx 0.26 e-."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.3646","kind":"arxiv","version":1},"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":"2026-05-18T02:02:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RsxALqiEyqXL7AIMh+uaR+3nTVAylvUnsTyj1W9vFQeENN8T2LeFCkRGMvJ3vNPlr6HYte6jQwqkXYSod4xfBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T05:35:32.549922Z"},"content_sha256":"5a10c706617fb14ebe800ef752a271d8a4054ce090e55eca8088f6aab0967949","schema_version":"1.0","event_id":"sha256:5a10c706617fb14ebe800ef752a271d8a4054ce090e55eca8088f6aab0967949"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7D2DVNQP64T3KKTIJ2ABDWZSZ3/bundle.json","state_url":"https://pith.science/pith/7D2DVNQP64T3KKTIJ2ABDWZSZ3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7D2DVNQP64T3KKTIJ2ABDWZSZ3/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":"2026-05-27T05:35:32Z","links":{"resolver":"https://pith.science/pith/7D2DVNQP64T3KKTIJ2ABDWZSZ3","bundle":"https://pith.science/pith/7D2DVNQP64T3KKTIJ2ABDWZSZ3/bundle.json","state":"https://pith.science/pith/7D2DVNQP64T3KKTIJ2ABDWZSZ3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7D2DVNQP64T3KKTIJ2ABDWZSZ3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:7D2DVNQP64T3KKTIJ2ABDWZSZ3","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":"d7d88c61c8dae684cd63b59f2a9812be2d038e9338e6732f61c44b10fcc310a4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-03-18T15:05:36Z","title_canon_sha256":"4ab142935acc84b9f0055bfc4c2272acb151949795625a9944223cc0613fa11e"},"schema_version":"1.0","source":{"id":"1103.3646","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.3646","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"arxiv_version","alias_value":"1103.3646v1","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.3646","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"pith_short_12","alias_value":"7D2DVNQP64T3","created_at":"2026-05-18T12:26:22Z"},{"alias_kind":"pith_short_16","alias_value":"7D2DVNQP64T3KKTI","created_at":"2026-05-18T12:26:22Z"},{"alias_kind":"pith_short_8","alias_value":"7D2DVNQP","created_at":"2026-05-18T12:26:22Z"}],"graph_snapshots":[{"event_id":"sha256:5a10c706617fb14ebe800ef752a271d8a4054ce090e55eca8088f6aab0967949","target":"graph","created_at":"2026-05-18T02:02:49Z","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":"X-ray absorption spectroscopy measurements in Pr0.5Ca0.5CoO3 and (Pr,Y)0.55Ca0.45CoO3 compositions reveal that the valence of praseodymium ions is stable and essentially +3 (Pr [4f 2]) in the metallic state, but abruptly changes when carriers localize approaching the oxidation state +4 (Pr [4f 1]). This mechanism appears to be the driving force of the metal-insulator transition. The ground insulating state of Pr0.5Ca0.5CoO3 is an homogeneous Co3.5-d state stabilized by a charge transfer from Pr to Co sites: 1/2Pr3+ + Co3.5 \\to 1/2Pr3+2d + Co3.5-d, with 2d \\approx 0.26 e-.","authors_text":"Aura J. Bar\\'on-Gonz\\'alez, Carlos Frontera, Esther Dudzik, Florin Radu, Javier Blasco, Jos\\'e Luis Garc\\'ia-Mu\\~noz, Radu Abrudan, Ralf Feyerherm, Sergio Valencia","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-03-18T15:05:36Z","title":"Observation of a valence transition in (Pr,Ca)CoO3 cobaltites: charge migration at the metal-insulator transition"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.3646","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":"sha256:3615fa98c5ff571c75ddaa875771256969f61c2e3f6e3c26d9eded1245fa60f1","target":"record","created_at":"2026-05-18T02:02:49Z","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":"d7d88c61c8dae684cd63b59f2a9812be2d038e9338e6732f61c44b10fcc310a4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2011-03-18T15:05:36Z","title_canon_sha256":"4ab142935acc84b9f0055bfc4c2272acb151949795625a9944223cc0613fa11e"},"schema_version":"1.0","source":{"id":"1103.3646","kind":"arxiv","version":1}},"canonical_sha256":"f8f43ab60ff727b52a684e8011db32cee79f75907cdad4c34996a0d6605b3dfe","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f8f43ab60ff727b52a684e8011db32cee79f75907cdad4c34996a0d6605b3dfe","first_computed_at":"2026-05-18T02:02:49.741503Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:02:49.741503Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"M6COR2zlJnnQvLbEvyljAGMkHk/PIKc8Ia7zm6kqEdz6+o3dJGyofbnDxBxEWT5PkvBvjgz2i4MO4OHcKNInCg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:02:49.742112Z","signed_message":"canonical_sha256_bytes"},"source_id":"1103.3646","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3615fa98c5ff571c75ddaa875771256969f61c2e3f6e3c26d9eded1245fa60f1","sha256:5a10c706617fb14ebe800ef752a271d8a4054ce090e55eca8088f6aab0967949"],"state_sha256":"11ba4fd7ad4bd224f996ac012409225ce427572db2e8cf73d539edf521a6ce74"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fx5gjsjEinDwO+jEAPNPcq/0OzZQbU59v9tu0sLKX/WaQmUT8Svhah3qF3vCMarhURkDMbmMa9x9kVj4wCZdDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T05:35:32.554496Z","bundle_sha256":"87a892a8b9eb9cbe97e54461c55efd965ad39bd69bd7981f936b23bc6ac051f1"}}