{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:CB23R7T4KTVT7LKWSDIA6Z2VZY","short_pith_number":"pith:CB23R7T4","canonical_record":{"source":{"id":"2102.08785","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2021-02-17T14:22:39Z","cross_cats_sorted":[],"title_canon_sha256":"1e922ddcc63ae397eef666ad27445a1c4c48813e2b85117a094e5d52d6555e01","abstract_canon_sha256":"8d83158fe25633bb413c6f6673a826a25118799d95d1aa9b7ea4203e9b10884b"},"schema_version":"1.0"},"canonical_sha256":"1075b8fe7c54eb3fad5690d00f6755ce146c29ad0f8689317c4d0cce9e78e44f","source":{"kind":"arxiv","id":"2102.08785","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.08785","created_at":"2026-07-05T02:52:42Z"},{"alias_kind":"arxiv_version","alias_value":"2102.08785v1","created_at":"2026-07-05T02:52:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.08785","created_at":"2026-07-05T02:52:42Z"},{"alias_kind":"pith_short_12","alias_value":"CB23R7T4KTVT","created_at":"2026-07-05T02:52:42Z"},{"alias_kind":"pith_short_16","alias_value":"CB23R7T4KTVT7LKW","created_at":"2026-07-05T02:52:42Z"},{"alias_kind":"pith_short_8","alias_value":"CB23R7T4","created_at":"2026-07-05T02:52:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:CB23R7T4KTVT7LKWSDIA6Z2VZY","target":"record","payload":{"canonical_record":{"source":{"id":"2102.08785","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2021-02-17T14:22:39Z","cross_cats_sorted":[],"title_canon_sha256":"1e922ddcc63ae397eef666ad27445a1c4c48813e2b85117a094e5d52d6555e01","abstract_canon_sha256":"8d83158fe25633bb413c6f6673a826a25118799d95d1aa9b7ea4203e9b10884b"},"schema_version":"1.0"},"canonical_sha256":"1075b8fe7c54eb3fad5690d00f6755ce146c29ad0f8689317c4d0cce9e78e44f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:52:42.057950Z","signature_b64":"OP/EkiQJViYPvOBHGzRjO3Pp8342C56H7Tz9I6qmbgBAm0wcUG/AHy1S61IMfBh3u0XVvkf7zvPmvzBlgJ6EDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1075b8fe7c54eb3fad5690d00f6755ce146c29ad0f8689317c4d0cce9e78e44f","last_reissued_at":"2026-07-05T02:52:42.057534Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:52:42.057534Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2102.08785","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":"2026-07-05T02:52:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QmjAS1sqK9eK0E+rLXACQhPe0jMOSn+8QKlSOUhci25wSLuDe42sZZ3n4qP8R0tk8MZXHOKXINihQoOv0A3zBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T14:53:30.804600Z"},"content_sha256":"8c54743e14c915d2165306263185546821fc87cfd53b5e1fb90fa7ad04c246e9","schema_version":"1.0","event_id":"sha256:8c54743e14c915d2165306263185546821fc87cfd53b5e1fb90fa7ad04c246e9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:CB23R7T4KTVT7LKWSDIA6Z2VZY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Single particle tunneling spectroscopy and superconducting gaps in layered iron based superconductor KCa$_{2}$Fe$_{4}$As$_{4}$F$_{2}$","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Hai-Hu Wen, Huan Yang, Huiqian Luo, Kailun Chen, Shiliang Li, Wen Duan, Wenshan Hong, Xiaoyu Chen","submitted_at":"2021-02-17T14:22:39Z","abstract_excerpt":"We perform scanning tunneling microscopy/spectroscopy study on the layered iron based superconductor KCa$_2$Fe$_4$As$_4$F$_2$ with a critical temperature of about 33.5 K. Two types of terminated surfaces are generally observed after cleaving the samples in vacuum. On one commonly obtained surface, we observe a full gap feature with energy gap values close to 4.6 meV. This type of spectrum shows a clean and uniform full gap in space, which indicates the absence of gap nodes in this superconductor. Quasiparticle interference patterns have also been measured, which show no scattering patterns bet"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.08785","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2102.08785/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T02:52:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vOnaZzfyo2obFPiTX5EwNZyAE3vjprrMjM3SyZ77o/ByepUMVktP7aMN0KkPQxvM5pWgqriLhVTYumTQpaYxDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T14:53:30.804968Z"},"content_sha256":"748c04f91a13cca14c7744ce03a21484b9bc6dbc45372e6ac390cc82c59d7030","schema_version":"1.0","event_id":"sha256:748c04f91a13cca14c7744ce03a21484b9bc6dbc45372e6ac390cc82c59d7030"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CB23R7T4KTVT7LKWSDIA6Z2VZY/bundle.json","state_url":"https://pith.science/pith/CB23R7T4KTVT7LKWSDIA6Z2VZY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CB23R7T4KTVT7LKWSDIA6Z2VZY/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":"2026-07-07T14:53:30Z","links":{"resolver":"https://pith.science/pith/CB23R7T4KTVT7LKWSDIA6Z2VZY","bundle":"https://pith.science/pith/CB23R7T4KTVT7LKWSDIA6Z2VZY/bundle.json","state":"https://pith.science/pith/CB23R7T4KTVT7LKWSDIA6Z2VZY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CB23R7T4KTVT7LKWSDIA6Z2VZY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:CB23R7T4KTVT7LKWSDIA6Z2VZY","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":"8d83158fe25633bb413c6f6673a826a25118799d95d1aa9b7ea4203e9b10884b","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2021-02-17T14:22:39Z","title_canon_sha256":"1e922ddcc63ae397eef666ad27445a1c4c48813e2b85117a094e5d52d6555e01"},"schema_version":"1.0","source":{"id":"2102.08785","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.08785","created_at":"2026-07-05T02:52:42Z"},{"alias_kind":"arxiv_version","alias_value":"2102.08785v1","created_at":"2026-07-05T02:52:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.08785","created_at":"2026-07-05T02:52:42Z"},{"alias_kind":"pith_short_12","alias_value":"CB23R7T4KTVT","created_at":"2026-07-05T02:52:42Z"},{"alias_kind":"pith_short_16","alias_value":"CB23R7T4KTVT7LKW","created_at":"2026-07-05T02:52:42Z"},{"alias_kind":"pith_short_8","alias_value":"CB23R7T4","created_at":"2026-07-05T02:52:42Z"}],"graph_snapshots":[{"event_id":"sha256:748c04f91a13cca14c7744ce03a21484b9bc6dbc45372e6ac390cc82c59d7030","target":"graph","created_at":"2026-07-05T02:52:42Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2102.08785/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We perform scanning tunneling microscopy/spectroscopy study on the layered iron based superconductor KCa$_2$Fe$_4$As$_4$F$_2$ with a critical temperature of about 33.5 K. Two types of terminated surfaces are generally observed after cleaving the samples in vacuum. On one commonly obtained surface, we observe a full gap feature with energy gap values close to 4.6 meV. This type of spectrum shows a clean and uniform full gap in space, which indicates the absence of gap nodes in this superconductor. Quasiparticle interference patterns have also been measured, which show no scattering patterns bet","authors_text":"Hai-Hu Wen, Huan Yang, Huiqian Luo, Kailun Chen, Shiliang Li, Wen Duan, Wenshan Hong, Xiaoyu Chen","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2021-02-17T14:22:39Z","title":"Single particle tunneling spectroscopy and superconducting gaps in layered iron based superconductor KCa$_{2}$Fe$_{4}$As$_{4}$F$_{2}$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.08785","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":"sha256:8c54743e14c915d2165306263185546821fc87cfd53b5e1fb90fa7ad04c246e9","target":"record","created_at":"2026-07-05T02:52:42Z","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":"8d83158fe25633bb413c6f6673a826a25118799d95d1aa9b7ea4203e9b10884b","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2021-02-17T14:22:39Z","title_canon_sha256":"1e922ddcc63ae397eef666ad27445a1c4c48813e2b85117a094e5d52d6555e01"},"schema_version":"1.0","source":{"id":"2102.08785","kind":"arxiv","version":1}},"canonical_sha256":"1075b8fe7c54eb3fad5690d00f6755ce146c29ad0f8689317c4d0cce9e78e44f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1075b8fe7c54eb3fad5690d00f6755ce146c29ad0f8689317c4d0cce9e78e44f","first_computed_at":"2026-07-05T02:52:42.057534Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:52:42.057534Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OP/EkiQJViYPvOBHGzRjO3Pp8342C56H7Tz9I6qmbgBAm0wcUG/AHy1S61IMfBh3u0XVvkf7zvPmvzBlgJ6EDg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:52:42.057950Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.08785","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8c54743e14c915d2165306263185546821fc87cfd53b5e1fb90fa7ad04c246e9","sha256:748c04f91a13cca14c7744ce03a21484b9bc6dbc45372e6ac390cc82c59d7030"],"state_sha256":"17a84617564ff7890943166ea21a54cd009b90d966777ad8d16a2a294ce96be4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mpYwY25xwhsyYaT5u4jK9r4j9xCXgs+yLJGIS2zuN74e0NB+++uRtZVJ1D6mGGSZkiTwaowAbSw5M7qTRYOEAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T14:53:30.806899Z","bundle_sha256":"590b99b1155cd1fc430b4ef049069fb5068d5ead8ab21c961b9cd5a14173e3e6"}}