{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:7IUNBHWB7BJFGBKR62ZKIPU23P","short_pith_number":"pith:7IUNBHWB","canonical_record":{"source":{"id":"1801.05142","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-01-16T07:44:09Z","cross_cats_sorted":["cond-mat.mtrl-sci","cond-mat.str-el"],"title_canon_sha256":"be771339cbf47032ead4552d1f22ddc3686b991dd8c977360ac74827aa926db1","abstract_canon_sha256":"0a4f02fff6be76822519ddb55628e4a6c33821d267bb2006700cb7301d4ec030"},"schema_version":"1.0"},"canonical_sha256":"fa28d09ec1f852530551f6b2a43e9adbfcef53a3a6e44e61fca2b9253f862fb5","source":{"kind":"arxiv","id":"1801.05142","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.05142","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"arxiv_version","alias_value":"1801.05142v4","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.05142","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"pith_short_12","alias_value":"7IUNBHWB7BJF","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"7IUNBHWB7BJFGBKR","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"7IUNBHWB","created_at":"2026-05-18T12:32:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:7IUNBHWB7BJFGBKR62ZKIPU23P","target":"record","payload":{"canonical_record":{"source":{"id":"1801.05142","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-01-16T07:44:09Z","cross_cats_sorted":["cond-mat.mtrl-sci","cond-mat.str-el"],"title_canon_sha256":"be771339cbf47032ead4552d1f22ddc3686b991dd8c977360ac74827aa926db1","abstract_canon_sha256":"0a4f02fff6be76822519ddb55628e4a6c33821d267bb2006700cb7301d4ec030"},"schema_version":"1.0"},"canonical_sha256":"fa28d09ec1f852530551f6b2a43e9adbfcef53a3a6e44e61fca2b9253f862fb5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:49.629874Z","signature_b64":"zuaQ/+Zi6qbIl0YNI1PXLZozsLAEAhEjdLLR5BQuEmZkNTlI0ULhNL1rb3dUjs1sH9gtiWBld5QnkLEhUHvyBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fa28d09ec1f852530551f6b2a43e9adbfcef53a3a6e44e61fca2b9253f862fb5","last_reissued_at":"2026-05-18T00:02:49.629294Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:49.629294Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.05142","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:02:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RTOYet9O1rKvUqMzVVXe5AM9b+irsG8ZLGIq5h9y4RA8s6GBICuAU3o5SdAkevzvux3IWvk3pWig0Ns2x2aiCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T02:53:25.881679Z"},"content_sha256":"a02f602a804ac470adcb3d3999082b5706b1423b82f9f9e74aeb5f998c50238e","schema_version":"1.0","event_id":"sha256:a02f602a804ac470adcb3d3999082b5706b1423b82f9f9e74aeb5f998c50238e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:7IUNBHWB7BJFGBKR62ZKIPU23P","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Atomic-layer-resolved composition and electronic structure of the cuprate Bi$_2$Sr$_2$CaCu$_2$O$_{8+\\delta}$ from soft x-ray standing-wave photoemission","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci","cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"Aaron Bostwick, Amina Taleb, Andr\\'es F. Santander-Syro, Charles S. Fadley, Cheng-Tai Kuo, Eric Gullikson, Fran\\c{c}ois Bertran, Giuseppina Conti, Ivan A.Vartanyants, Jeffrey B. Kortright, Julia Meyer-Ilse, Julien E. Rault, Luca Moreschini, Patrick Le F\\`evre, Romuald Saint-Martin, Shih-Chieh Lin, Shu-Ting Pi, Slavomir Nem\\v{s}\\'ak, Warren E. Pickett","submitted_at":"2018-01-16T07:44:09Z","abstract_excerpt":"A major remaining challenge in the superconducting cuprates is the unambiguous differentiation of the composition and electronic structure of the CuO$_2$ layers and those of the intermediate layers. The large c axis for these materials permits employing soft x-ray (930.3 eV) standing wave (SW) excitation in photoemission that yields atomic layer-by-atomic layer depth resolution of these properties. Applying SW photoemission to Bi$_2$Sr$_2$CaCu$_2$O$_{8+\\delta}$ yields the depth distribution of atomic composition and the layer-resolved densities of states. We detect significant Ca presence in t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.05142","kind":"arxiv","version":4},"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":"2026-05-18T00:02:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7sdem9+KQNmajiVxhvVbR7NBTEXxxznzSTGh1kVZKQytz2QfqRKYFhRhVBA/jf9Mx58f86PP6p8cGI2qypgADQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T02:53:25.882337Z"},"content_sha256":"4135f3baf70dd60f4d8f2a561fa4e222f8d4169978ef45bad38762340e182678","schema_version":"1.0","event_id":"sha256:4135f3baf70dd60f4d8f2a561fa4e222f8d4169978ef45bad38762340e182678"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7IUNBHWB7BJFGBKR62ZKIPU23P/bundle.json","state_url":"https://pith.science/pith/7IUNBHWB7BJFGBKR62ZKIPU23P/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7IUNBHWB7BJFGBKR62ZKIPU23P/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":"2026-06-04T02:53:25Z","links":{"resolver":"https://pith.science/pith/7IUNBHWB7BJFGBKR62ZKIPU23P","bundle":"https://pith.science/pith/7IUNBHWB7BJFGBKR62ZKIPU23P/bundle.json","state":"https://pith.science/pith/7IUNBHWB7BJFGBKR62ZKIPU23P/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7IUNBHWB7BJFGBKR62ZKIPU23P/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:7IUNBHWB7BJFGBKR62ZKIPU23P","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":"0a4f02fff6be76822519ddb55628e4a6c33821d267bb2006700cb7301d4ec030","cross_cats_sorted":["cond-mat.mtrl-sci","cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-01-16T07:44:09Z","title_canon_sha256":"be771339cbf47032ead4552d1f22ddc3686b991dd8c977360ac74827aa926db1"},"schema_version":"1.0","source":{"id":"1801.05142","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.05142","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"arxiv_version","alias_value":"1801.05142v4","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.05142","created_at":"2026-05-18T00:02:49Z"},{"alias_kind":"pith_short_12","alias_value":"7IUNBHWB7BJF","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"7IUNBHWB7BJFGBKR","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"7IUNBHWB","created_at":"2026-05-18T12:32:11Z"}],"graph_snapshots":[{"event_id":"sha256:4135f3baf70dd60f4d8f2a561fa4e222f8d4169978ef45bad38762340e182678","target":"graph","created_at":"2026-05-18T00:02:49Z","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":"A major remaining challenge in the superconducting cuprates is the unambiguous differentiation of the composition and electronic structure of the CuO$_2$ layers and those of the intermediate layers. The large c axis for these materials permits employing soft x-ray (930.3 eV) standing wave (SW) excitation in photoemission that yields atomic layer-by-atomic layer depth resolution of these properties. Applying SW photoemission to Bi$_2$Sr$_2$CaCu$_2$O$_{8+\\delta}$ yields the depth distribution of atomic composition and the layer-resolved densities of states. We detect significant Ca presence in t","authors_text":"Aaron Bostwick, Amina Taleb, Andr\\'es F. Santander-Syro, Charles S. Fadley, Cheng-Tai Kuo, Eric Gullikson, Fran\\c{c}ois Bertran, Giuseppina Conti, Ivan A.Vartanyants, Jeffrey B. Kortright, Julia Meyer-Ilse, Julien E. Rault, Luca Moreschini, Patrick Le F\\`evre, Romuald Saint-Martin, Shih-Chieh Lin, Shu-Ting Pi, Slavomir Nem\\v{s}\\'ak, Warren E. Pickett","cross_cats":["cond-mat.mtrl-sci","cond-mat.str-el"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-01-16T07:44:09Z","title":"Atomic-layer-resolved composition and electronic structure of the cuprate Bi$_2$Sr$_2$CaCu$_2$O$_{8+\\delta}$ from soft x-ray standing-wave photoemission"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.05142","kind":"arxiv","version":4},"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:a02f602a804ac470adcb3d3999082b5706b1423b82f9f9e74aeb5f998c50238e","target":"record","created_at":"2026-05-18T00:02:49Z","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":"0a4f02fff6be76822519ddb55628e4a6c33821d267bb2006700cb7301d4ec030","cross_cats_sorted":["cond-mat.mtrl-sci","cond-mat.str-el"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-01-16T07:44:09Z","title_canon_sha256":"be771339cbf47032ead4552d1f22ddc3686b991dd8c977360ac74827aa926db1"},"schema_version":"1.0","source":{"id":"1801.05142","kind":"arxiv","version":4}},"canonical_sha256":"fa28d09ec1f852530551f6b2a43e9adbfcef53a3a6e44e61fca2b9253f862fb5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fa28d09ec1f852530551f6b2a43e9adbfcef53a3a6e44e61fca2b9253f862fb5","first_computed_at":"2026-05-18T00:02:49.629294Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:49.629294Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zuaQ/+Zi6qbIl0YNI1PXLZozsLAEAhEjdLLR5BQuEmZkNTlI0ULhNL1rb3dUjs1sH9gtiWBld5QnkLEhUHvyBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:49.629874Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.05142","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a02f602a804ac470adcb3d3999082b5706b1423b82f9f9e74aeb5f998c50238e","sha256:4135f3baf70dd60f4d8f2a561fa4e222f8d4169978ef45bad38762340e182678"],"state_sha256":"c4beb637748347f750c206123eca5c1bcc35cbf4fad5955f0110cdf1a0c7e65b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"h7+5YRmTicUZvJ8SE8mD0F77hMvsxY3rQ1aT+3bKU20t85pHsUIxn5e0KaKv7edZLrSlAKW3B7sLrvkLvt3qBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T02:53:25.886011Z","bundle_sha256":"ab23c7ff3b4441a7dc6d74f4b014e4c4a46543da392b5521e31da8b022f145c2"}}