{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:3TOO3HQ2ZJALAWFF4TXWQPUZZ6","short_pith_number":"pith:3TOO3HQ2","canonical_record":{"source":{"id":"1904.04670","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-04-09T13:45:38Z","cross_cats_sorted":["cond-mat.mtrl-sci","cond-mat.str-el"],"title_canon_sha256":"12302e1c1b4c75daf910f69acdcd67ead93981be3d98b1fb1502f9ee9c4e5795","abstract_canon_sha256":"5729c16d461da109bcdb0bbb1a3583c48f52752e16d31cdc994413a89a00b4c3"},"schema_version":"1.0"},"canonical_sha256":"dcdced9e1aca40b058a5e4ef683e99cfa45cd9c86a52b26b1a2bfa028c567c3f","source":{"kind":"arxiv","id":"1904.04670","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.04670","created_at":"2026-05-17T23:48:58Z"},{"alias_kind":"arxiv_version","alias_value":"1904.04670v1","created_at":"2026-05-17T23:48:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.04670","created_at":"2026-05-17T23:48:58Z"},{"alias_kind":"pith_short_12","alias_value":"3TOO3HQ2ZJAL","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_16","alias_value":"3TOO3HQ2ZJALAWFF","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_8","alias_value":"3TOO3HQ2","created_at":"2026-05-18T12:33:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:3TOO3HQ2ZJALAWFF4TXWQPUZZ6","target":"record","payload":{"canonical_record":{"source":{"id":"1904.04670","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-04-09T13:45:38Z","cross_cats_sorted":["cond-mat.mtrl-sci","cond-mat.str-el"],"title_canon_sha256":"12302e1c1b4c75daf910f69acdcd67ead93981be3d98b1fb1502f9ee9c4e5795","abstract_canon_sha256":"5729c16d461da109bcdb0bbb1a3583c48f52752e16d31cdc994413a89a00b4c3"},"schema_version":"1.0"},"canonical_sha256":"dcdced9e1aca40b058a5e4ef683e99cfa45cd9c86a52b26b1a2bfa028c567c3f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:48:58.466682Z","signature_b64":"wOlvvFXP0457Y/2qyXqIYFE7Y14q9p5xGrjZzYAds7zOXBC+DHtBWSfa4l6fj5S58o6eCFTi3D735c191XSaCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dcdced9e1aca40b058a5e4ef683e99cfa45cd9c86a52b26b1a2bfa028c567c3f","last_reissued_at":"2026-05-17T23:48:58.466275Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:48:58.466275Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.04670","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:48:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7Q5DKvh9ZdB8qfsXGaeu/XJwmveikvcPiuHPc4DaQlWTAfBjVIOwdExaLehKt/aIMYeydofh5IxtC0OBq+9+DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:31:03.137745Z"},"content_sha256":"527974603a00725c806cc0da016c934470bd9dd13b658713b4d56f8d1f101253","schema_version":"1.0","event_id":"sha256:527974603a00725c806cc0da016c934470bd9dd13b658713b4d56f8d1f101253"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:3TOO3HQ2ZJALAWFF4TXWQPUZZ6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Identification of a Large Amount of Excess Fe in Superconducting Single-Layer FeSe/SrTiO3 Films","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":"Cong Li, Guodong Liu, Jianwei Huang, Lin Zhao, Qingyan Wang, Shaolong He, X. J. Zhou, Yong Hu, Yu Xu","submitted_at":"2019-04-09T13:45:38Z","abstract_excerpt":"The single-layer FeSe films grown on SrTiO3 (STO) substrates have attracted much attention because of its record high superconducting critical temperature (Tc). It is usually believed that the composition of the epitaxially grown single-layer FeSe/STO films is stoichiometric, i.e., the ratio of Fe and Se is 1:1. Here we report the identification of a large amount of excess Fe in the superconducting single-layer FeSe/STO films. By depositing Se onto the superconducting single-layer FeSe/STO films, we find by in situ scanning tunneling microscopy (STM) the formation of the second-layer FeSe isla"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.04670","kind":"arxiv","version":1},"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":"2026-05-17T23:48:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sTLhGIf5/cniZcDBgggz5psZWQbir6p6iFlIRJzbqsuuLN+FsbXniCbqb3b1xChFnixiiRRq0QPXNUkbUSJ7DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:31:03.138439Z"},"content_sha256":"bace48b98f67360a380497823249d13b128a9274747b3f0d9a761419dde5dca7","schema_version":"1.0","event_id":"sha256:bace48b98f67360a380497823249d13b128a9274747b3f0d9a761419dde5dca7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3TOO3HQ2ZJALAWFF4TXWQPUZZ6/bundle.json","state_url":"https://pith.science/pith/3TOO3HQ2ZJALAWFF4TXWQPUZZ6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3TOO3HQ2ZJALAWFF4TXWQPUZZ6/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":"2026-05-25T18:31:03Z","links":{"resolver":"https://pith.science/pith/3TOO3HQ2ZJALAWFF4TXWQPUZZ6","bundle":"https://pith.science/pith/3TOO3HQ2ZJALAWFF4TXWQPUZZ6/bundle.json","state":"https://pith.science/pith/3TOO3HQ2ZJALAWFF4TXWQPUZZ6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3TOO3HQ2ZJALAWFF4TXWQPUZZ6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:3TOO3HQ2ZJALAWFF4TXWQPUZZ6","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":"5729c16d461da109bcdb0bbb1a3583c48f52752e16d31cdc994413a89a00b4c3","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":"2019-04-09T13:45:38Z","title_canon_sha256":"12302e1c1b4c75daf910f69acdcd67ead93981be3d98b1fb1502f9ee9c4e5795"},"schema_version":"1.0","source":{"id":"1904.04670","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.04670","created_at":"2026-05-17T23:48:58Z"},{"alias_kind":"arxiv_version","alias_value":"1904.04670v1","created_at":"2026-05-17T23:48:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.04670","created_at":"2026-05-17T23:48:58Z"},{"alias_kind":"pith_short_12","alias_value":"3TOO3HQ2ZJAL","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_16","alias_value":"3TOO3HQ2ZJALAWFF","created_at":"2026-05-18T12:33:10Z"},{"alias_kind":"pith_short_8","alias_value":"3TOO3HQ2","created_at":"2026-05-18T12:33:10Z"}],"graph_snapshots":[{"event_id":"sha256:bace48b98f67360a380497823249d13b128a9274747b3f0d9a761419dde5dca7","target":"graph","created_at":"2026-05-17T23:48:58Z","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":"The single-layer FeSe films grown on SrTiO3 (STO) substrates have attracted much attention because of its record high superconducting critical temperature (Tc). It is usually believed that the composition of the epitaxially grown single-layer FeSe/STO films is stoichiometric, i.e., the ratio of Fe and Se is 1:1. Here we report the identification of a large amount of excess Fe in the superconducting single-layer FeSe/STO films. By depositing Se onto the superconducting single-layer FeSe/STO films, we find by in situ scanning tunneling microscopy (STM) the formation of the second-layer FeSe isla","authors_text":"Cong Li, Guodong Liu, Jianwei Huang, Lin Zhao, Qingyan Wang, Shaolong He, X. J. Zhou, Yong Hu, Yu Xu","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":"2019-04-09T13:45:38Z","title":"Identification of a Large Amount of Excess Fe in Superconducting Single-Layer FeSe/SrTiO3 Films"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.04670","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":"sha256:527974603a00725c806cc0da016c934470bd9dd13b658713b4d56f8d1f101253","target":"record","created_at":"2026-05-17T23:48:58Z","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":"5729c16d461da109bcdb0bbb1a3583c48f52752e16d31cdc994413a89a00b4c3","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":"2019-04-09T13:45:38Z","title_canon_sha256":"12302e1c1b4c75daf910f69acdcd67ead93981be3d98b1fb1502f9ee9c4e5795"},"schema_version":"1.0","source":{"id":"1904.04670","kind":"arxiv","version":1}},"canonical_sha256":"dcdced9e1aca40b058a5e4ef683e99cfa45cd9c86a52b26b1a2bfa028c567c3f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dcdced9e1aca40b058a5e4ef683e99cfa45cd9c86a52b26b1a2bfa028c567c3f","first_computed_at":"2026-05-17T23:48:58.466275Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:48:58.466275Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wOlvvFXP0457Y/2qyXqIYFE7Y14q9p5xGrjZzYAds7zOXBC+DHtBWSfa4l6fj5S58o6eCFTi3D735c191XSaCQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:48:58.466682Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.04670","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:527974603a00725c806cc0da016c934470bd9dd13b658713b4d56f8d1f101253","sha256:bace48b98f67360a380497823249d13b128a9274747b3f0d9a761419dde5dca7"],"state_sha256":"ce8828ccf9b178e2e0c2d219d8b4827839278b4cc24b533a7a0947ec452d80cf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/skvHZOusVGldW8h3plenl7ain0cTtqbVYPMGzBwpxpCnMI4CoXRt3vsdYiKveTH9MajJF4G3knDv1rwvjw9Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:31:03.142434Z","bundle_sha256":"9c0bf5f229dbb0e8fbfcdd3b2cd0b11eadc4a2ee2dc89a8e92ca67b4ad28de05"}}