{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:B7MZ3EBUZTCEV3QALZ75RGMQEO","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":"24ae20fb25f454f7bf3a4a6c5faccfc73d665f0b45f8781181439978639482d4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-07-27T05:29:57Z","title_canon_sha256":"34c8e62bdf108543f13fe3cddeb35e9d5bddafb6d15ff1322b06ebff9e4e070c"},"schema_version":"1.0","source":{"id":"0907.4545","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.4545","created_at":"2026-05-18T02:12:53Z"},{"alias_kind":"arxiv_version","alias_value":"0907.4545v2","created_at":"2026-05-18T02:12:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.4545","created_at":"2026-05-18T02:12:53Z"},{"alias_kind":"pith_short_12","alias_value":"B7MZ3EBUZTCE","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"B7MZ3EBUZTCEV3QA","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"B7MZ3EBU","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:e12899ecc0eda1763630594f905f5d156b051222bf1715339e4a8d5cdf82b7cd","target":"graph","created_at":"2026-05-18T02:12:53Z","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":"Optical conductivity [$\\sigma(\\omega)$] of YbS has been measured under pressure up to 20 GPa. Below 8 GPa, $\\sigma(\\omega)$ is low since YbS is an insulator with an energy gap between fully occupied 4$f$ state and unoccupied conduction ($c$) band. Above 8 GPa, however, $\\sigma(\\omega)$ increases dramatically, developing a Drude component due to heavy carriers and characteristic infrared peaks. It is shown that increasing pressure has caused an energy overlap and hybridization between the $c$ band and 4$f$ state, thus driving the initially ionic and insulating YbS into a correlated metal with h","authors_text":"A. Ochiai, H. Okamura, M. Matsunami, T. Nanba","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-07-27T05:29:57Z","title":"Pressure Tuning of an Ionic Insulator into a Heavy Electron Metal: An Infrared Study of YbS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.4545","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:dc556c95a11cccb3af1978e7f8258fe928c71df529ddc9b0ac16abbc5d458933","target":"record","created_at":"2026-05-18T02:12:53Z","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":"24ae20fb25f454f7bf3a4a6c5faccfc73d665f0b45f8781181439978639482d4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-07-27T05:29:57Z","title_canon_sha256":"34c8e62bdf108543f13fe3cddeb35e9d5bddafb6d15ff1322b06ebff9e4e070c"},"schema_version":"1.0","source":{"id":"0907.4545","kind":"arxiv","version":2}},"canonical_sha256":"0fd99d9034ccc44aee005e7fd8999023906f7199be73e0471f6809753211ca1d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0fd99d9034ccc44aee005e7fd8999023906f7199be73e0471f6809753211ca1d","first_computed_at":"2026-05-18T02:12:53.463484Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:53.463484Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9kQ5kKkoBRnc54z1eFuakjuPEPE4exOR4UNMJvHDGvWYa5mwT8TwwLclnToaMuD0xSiRxuQv2Adlpvbel91jDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:53.464350Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.4545","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dc556c95a11cccb3af1978e7f8258fe928c71df529ddc9b0ac16abbc5d458933","sha256:e12899ecc0eda1763630594f905f5d156b051222bf1715339e4a8d5cdf82b7cd"],"state_sha256":"4970ec38b1cfaca6c0076593a14a0cc4e13d72ba090ab98a2ccab0ee7ae64856"}