{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:5UTGYWLXOSG6GIFEEVPJA3XXTH","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":"e33f08c0bee983906f48f51104a54134458398848144897f9a4137d4830c0fd7","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2014-09-19T08:34:32Z","title_canon_sha256":"39941312ebd67de335a070c629dbc66aacdb91963f17e439eb79b5b1f33fefb4"},"schema_version":"1.0","source":{"id":"1409.5547","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.5547","created_at":"2026-05-18T01:00:20Z"},{"alias_kind":"arxiv_version","alias_value":"1409.5547v1","created_at":"2026-05-18T01:00:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.5547","created_at":"2026-05-18T01:00:20Z"},{"alias_kind":"pith_short_12","alias_value":"5UTGYWLXOSG6","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_16","alias_value":"5UTGYWLXOSG6GIFE","created_at":"2026-05-18T12:28:16Z"},{"alias_kind":"pith_short_8","alias_value":"5UTGYWLX","created_at":"2026-05-18T12:28:16Z"}],"graph_snapshots":[{"event_id":"sha256:189e79bc471d4a720768109d99df593c5b4ef6088057967a09bfd0c1673ad833","target":"graph","created_at":"2026-05-18T01:00:20Z","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 investigate the pressure and temperature dependence of the lattice dynamics of the underdoped, stoichiometric, high temperature superconductor YBa2Cu4O8 by means of Raman spectroscopy and ab initio calculations. This system undergoes a reversible pressure-induced structural phase transition around 10 GPa to a collapsed orthorhombic structure, that is well reproduced by the calculation. The coupling of the B1g-like buckling phonon mode to the electronic continuum is used to probe superconductivity. In the low pressure phase, self-energy effects through the superconducting transition renormal","authors_text":"A. Subedi, B. Keimer, C.T. Lin, K. Syassen, M. Le Tacon, S. M. Souliou, Y.T. Song","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2014-09-19T08:34:32Z","title":"Pressure-induced phase transition and superconductivity in YBa2Cu4O8"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.5547","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":"sha256:3803330be5c7fb3b68305a8fc4b1b0d5d15122317dad02194be9457838292320","target":"record","created_at":"2026-05-18T01:00:20Z","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":"e33f08c0bee983906f48f51104a54134458398848144897f9a4137d4830c0fd7","cross_cats_sorted":["cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2014-09-19T08:34:32Z","title_canon_sha256":"39941312ebd67de335a070c629dbc66aacdb91963f17e439eb79b5b1f33fefb4"},"schema_version":"1.0","source":{"id":"1409.5547","kind":"arxiv","version":1}},"canonical_sha256":"ed266c5977748de320a4255e906ef799dba99edb8895f98028a0e318ce5ce7b7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ed266c5977748de320a4255e906ef799dba99edb8895f98028a0e318ce5ce7b7","first_computed_at":"2026-05-18T01:00:20.401206Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:00:20.401206Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"p/DOOSNM6gMGGH3/6f65yS5BG/RIWQyskKA+NY+5MftFjkrwl/RD0zDQ9DDkLx5iJ3eSaNdycpt5Jyt0wOoCDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:00:20.401739Z","signed_message":"canonical_sha256_bytes"},"source_id":"1409.5547","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3803330be5c7fb3b68305a8fc4b1b0d5d15122317dad02194be9457838292320","sha256:189e79bc471d4a720768109d99df593c5b4ef6088057967a09bfd0c1673ad833"],"state_sha256":"cb1531e7e08759667a78808f0f1e90425952ba17fab2416c3301177b06915919"}