{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:OR3FSNZQJNG6YKRYQFJY4VHBHX","short_pith_number":"pith:OR3FSNZQ","canonical_record":{"source":{"id":"0903.2097","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-03-12T05:21:44Z","cross_cats_sorted":["cond-mat.supr-con"],"title_canon_sha256":"ee958555a07c411fe9859d6378fd88ebd0f18af72f6d957e6c7d6376f24fd274","abstract_canon_sha256":"247660c35d1f67382bb26903a9c85a4bd768b5686d13ae9052299f566babc269"},"schema_version":"1.0"},"canonical_sha256":"74765937304b4dec2a3881538e54e13dc1e1fc29689bf7ad560a4743ae1c943f","source":{"kind":"arxiv","id":"0903.2097","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.2097","created_at":"2026-05-18T02:14:35Z"},{"alias_kind":"arxiv_version","alias_value":"0903.2097v2","created_at":"2026-05-18T02:14:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.2097","created_at":"2026-05-18T02:14:35Z"},{"alias_kind":"pith_short_12","alias_value":"OR3FSNZQJNG6","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"OR3FSNZQJNG6YKRY","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"OR3FSNZQ","created_at":"2026-05-18T12:26:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:OR3FSNZQJNG6YKRYQFJY4VHBHX","target":"record","payload":{"canonical_record":{"source":{"id":"0903.2097","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-03-12T05:21:44Z","cross_cats_sorted":["cond-mat.supr-con"],"title_canon_sha256":"ee958555a07c411fe9859d6378fd88ebd0f18af72f6d957e6c7d6376f24fd274","abstract_canon_sha256":"247660c35d1f67382bb26903a9c85a4bd768b5686d13ae9052299f566babc269"},"schema_version":"1.0"},"canonical_sha256":"74765937304b4dec2a3881538e54e13dc1e1fc29689bf7ad560a4743ae1c943f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:35.639282Z","signature_b64":"eVOodZhhZZKk5bsr+rbcXUr92IecXnyhIUs5UHmGocKsHgYQp/oUp3hQWcqnA5ToHQceVjDVM6eYo1NuWZ4kDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"74765937304b4dec2a3881538e54e13dc1e1fc29689bf7ad560a4743ae1c943f","last_reissued_at":"2026-05-18T02:14:35.638648Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:35.638648Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0903.2097","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":"2026-05-18T02:14:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"paMxGxc6BWpJjg81DQltVH/EazJuGtb7YI86MwGlevtM7b8UtgDZE4aV4kyBDl7NMwfCT/xHwQkTmnWxA1/fAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T20:35:15.425667Z"},"content_sha256":"8c64aa0680c724bed88626ef86c00fdee859886663f9df7ec7f4152510505519","schema_version":"1.0","event_id":"sha256:8c64aa0680c724bed88626ef86c00fdee859886663f9df7ec7f4152510505519"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:OR3FSNZQJNG6YKRYQFJY4VHBHX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Anomalous Expansion of the Copper-Apical Oxygen Distance in Superconducting La$_{2}$CuO$_{4}$ - La$_{1.55}$Sr$_{0.45}$CuO$_{4}$ Bilayers","license":"http://creativecommons.org/licenses/publicdomain/","headline":"","cross_cats":["cond-mat.supr-con"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Gennady Logvenov, Hua Zhou, Ivan Bozovic, Ron Pindak, Vladimir Butko, Yizhak Yacoby","submitted_at":"2009-03-12T05:21:44Z","abstract_excerpt":"We have introduced an improved X-ray phase-retrieval method with unprecedented speed of convergence and precision, and used it to determine with sub-{\\AA}ngstrom resolution the complete atomic structure of an ultrathin superconducting bilayer film, composed of La$_{1.55}$Sr$_{0.45}$CuO$_{4}$ and La$_{2}$CuO$_{4}$ neither of which is superconducting by itself. The results show that phase-retrieval diffraction techniques enable accurate measurement of structural modifications in near-surface layers, which may be critically important for elucidation of surface-sensitive experiments. Specifically "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.2097","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":"2026-05-18T02:14:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UhBEiUKQlcmf470L53+eBB6+TmJWjtm2JT+WPvxYwdUH7j0pr8IRl2bHM+kY7iQHKVJjhTm9L4Lq23BEFwAeCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T20:35:15.426024Z"},"content_sha256":"e9e2ce55d2e82643fb9c569f171b4d6808347f5e50fdf91747067a3cc10ab421","schema_version":"1.0","event_id":"sha256:e9e2ce55d2e82643fb9c569f171b4d6808347f5e50fdf91747067a3cc10ab421"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OR3FSNZQJNG6YKRYQFJY4VHBHX/bundle.json","state_url":"https://pith.science/pith/OR3FSNZQJNG6YKRYQFJY4VHBHX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OR3FSNZQJNG6YKRYQFJY4VHBHX/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":"2026-06-10T20:35:15Z","links":{"resolver":"https://pith.science/pith/OR3FSNZQJNG6YKRYQFJY4VHBHX","bundle":"https://pith.science/pith/OR3FSNZQJNG6YKRYQFJY4VHBHX/bundle.json","state":"https://pith.science/pith/OR3FSNZQJNG6YKRYQFJY4VHBHX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OR3FSNZQJNG6YKRYQFJY4VHBHX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:OR3FSNZQJNG6YKRYQFJY4VHBHX","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":"247660c35d1f67382bb26903a9c85a4bd768b5686d13ae9052299f566babc269","cross_cats_sorted":["cond-mat.supr-con"],"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-03-12T05:21:44Z","title_canon_sha256":"ee958555a07c411fe9859d6378fd88ebd0f18af72f6d957e6c7d6376f24fd274"},"schema_version":"1.0","source":{"id":"0903.2097","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.2097","created_at":"2026-05-18T02:14:35Z"},{"alias_kind":"arxiv_version","alias_value":"0903.2097v2","created_at":"2026-05-18T02:14:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.2097","created_at":"2026-05-18T02:14:35Z"},{"alias_kind":"pith_short_12","alias_value":"OR3FSNZQJNG6","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_16","alias_value":"OR3FSNZQJNG6YKRY","created_at":"2026-05-18T12:26:01Z"},{"alias_kind":"pith_short_8","alias_value":"OR3FSNZQ","created_at":"2026-05-18T12:26:01Z"}],"graph_snapshots":[{"event_id":"sha256:e9e2ce55d2e82643fb9c569f171b4d6808347f5e50fdf91747067a3cc10ab421","target":"graph","created_at":"2026-05-18T02:14:35Z","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 have introduced an improved X-ray phase-retrieval method with unprecedented speed of convergence and precision, and used it to determine with sub-{\\AA}ngstrom resolution the complete atomic structure of an ultrathin superconducting bilayer film, composed of La$_{1.55}$Sr$_{0.45}$CuO$_{4}$ and La$_{2}$CuO$_{4}$ neither of which is superconducting by itself. The results show that phase-retrieval diffraction techniques enable accurate measurement of structural modifications in near-surface layers, which may be critically important for elucidation of surface-sensitive experiments. Specifically ","authors_text":"Gennady Logvenov, Hua Zhou, Ivan Bozovic, Ron Pindak, Vladimir Butko, Yizhak Yacoby","cross_cats":["cond-mat.supr-con"],"headline":"","license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-03-12T05:21:44Z","title":"Anomalous Expansion of the Copper-Apical Oxygen Distance in Superconducting La$_{2}$CuO$_{4}$ - La$_{1.55}$Sr$_{0.45}$CuO$_{4}$ Bilayers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.2097","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":"sha256:8c64aa0680c724bed88626ef86c00fdee859886663f9df7ec7f4152510505519","target":"record","created_at":"2026-05-18T02:14:35Z","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":"247660c35d1f67382bb26903a9c85a4bd768b5686d13ae9052299f566babc269","cross_cats_sorted":["cond-mat.supr-con"],"license":"http://creativecommons.org/licenses/publicdomain/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-03-12T05:21:44Z","title_canon_sha256":"ee958555a07c411fe9859d6378fd88ebd0f18af72f6d957e6c7d6376f24fd274"},"schema_version":"1.0","source":{"id":"0903.2097","kind":"arxiv","version":2}},"canonical_sha256":"74765937304b4dec2a3881538e54e13dc1e1fc29689bf7ad560a4743ae1c943f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"74765937304b4dec2a3881538e54e13dc1e1fc29689bf7ad560a4743ae1c943f","first_computed_at":"2026-05-18T02:14:35.638648Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:14:35.638648Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eVOodZhhZZKk5bsr+rbcXUr92IecXnyhIUs5UHmGocKsHgYQp/oUp3hQWcqnA5ToHQceVjDVM6eYo1NuWZ4kDw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:14:35.639282Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.2097","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8c64aa0680c724bed88626ef86c00fdee859886663f9df7ec7f4152510505519","sha256:e9e2ce55d2e82643fb9c569f171b4d6808347f5e50fdf91747067a3cc10ab421"],"state_sha256":"7a3e36dc62e24b2263cbf38da9b55f4497df105e3684aecdd7763d402c873eb9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TXlZqvpkfcGFRKXbOjH+8jcgWbeEGsQt1oXpCmYnk64j9QabA9hgexjBX4A+rEzUNKOdu1tsS7t16gTg8ko9Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T20:35:15.428024Z","bundle_sha256":"ffd2605a79ebc1599bd07332db78e7aa9cbbac2058e2db1ce60ea61a66c10532"}}