{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:NUUIGZPRKCH66ZKTWW46MRJVBP","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":"5c961deb9eec828d4110c20560068af70cafb76347240ea06c90ddbf098c9a75","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-09-24T10:25:16Z","title_canon_sha256":"8520c9677aeea533234ea30b312674cdd3ac5ec92aa57ec58e377378b398d65c"},"schema_version":"1.0","source":{"id":"1409.6888","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1409.6888","created_at":"2026-05-18T02:41:40Z"},{"alias_kind":"arxiv_version","alias_value":"1409.6888v1","created_at":"2026-05-18T02:41:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1409.6888","created_at":"2026-05-18T02:41:40Z"},{"alias_kind":"pith_short_12","alias_value":"NUUIGZPRKCH6","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_16","alias_value":"NUUIGZPRKCH66ZKT","created_at":"2026-05-18T12:28:41Z"},{"alias_kind":"pith_short_8","alias_value":"NUUIGZPR","created_at":"2026-05-18T12:28:41Z"}],"graph_snapshots":[{"event_id":"sha256:cd6b3ac4fe34bc9514c496a34290140814c26d1fab9803033a3d57d27f5533b1","target":"graph","created_at":"2026-05-18T02:41:40Z","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":"Coherent phonons (CP) generated by laser pulses on the femtosecond scale have been proposed as a means to achieve ultrafast, non-thermal switching in phase-change materials such as Ge$_{2}$Sb$_{2}$Te$_{5}$(GST). Here we use ultrafast optical pump pulses to induce coherent acoustic phonons and stroboscopically measure the corresponding lattice distortions in GST using 100 ps x-ray pulses from the ESRF storage ring. A linear-chain model provides a good description of the observed changes in the diffraction signal, however, the magnitudes of the measured shifts are too large to be explained by th","authors_text":"Alessandro Giussani, Alexander V. Kolobov, Henning Riechert, Junji Tominaga, Kirill V. Mitrofanov, Michael Hanke, Muneaki Hase, Paul Fons, Peter Rodenbach, Raffaella Calarco, Robert E. Simpson, Roman Shayduk","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-09-24T10:25:16Z","title":"Picosecond strain dynamics in Ge$_{2}$Sb$_{2}$Te$_{5}$ monitored by time-resolved x-ray diffraction"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.6888","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":"sha256:0ae4bb6cf919634b58cd0511d6378e56779860216abc49ece9b1c2d646f49ce9","target":"record","created_at":"2026-05-18T02:41:40Z","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":"5c961deb9eec828d4110c20560068af70cafb76347240ea06c90ddbf098c9a75","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-09-24T10:25:16Z","title_canon_sha256":"8520c9677aeea533234ea30b312674cdd3ac5ec92aa57ec58e377378b398d65c"},"schema_version":"1.0","source":{"id":"1409.6888","kind":"arxiv","version":1}},"canonical_sha256":"6d288365f1508fef6553b5b9e645350bea633e41c2f652447e60aa0c56d46d7c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6d288365f1508fef6553b5b9e645350bea633e41c2f652447e60aa0c56d46d7c","first_computed_at":"2026-05-18T02:41:40.844798Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:41:40.844798Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"l126CC6UF4dNJJ82QmSnFtUGN6hcXTtiN/zDqVTHVXhPptoHlFK/w2mGdV3lPPeQ8BQWm4csb+l0XVZHRXraBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:41:40.845543Z","signed_message":"canonical_sha256_bytes"},"source_id":"1409.6888","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0ae4bb6cf919634b58cd0511d6378e56779860216abc49ece9b1c2d646f49ce9","sha256:cd6b3ac4fe34bc9514c496a34290140814c26d1fab9803033a3d57d27f5533b1"],"state_sha256":"39cfbda62fb8908541537ddc9661b6424a7cffbaf61f9f7b07c5fa560fe65a89"}