{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:XUQ5PWJFW5OQVWRF4EPDRIVY7X","short_pith_number":"pith:XUQ5PWJF","canonical_record":{"source":{"id":"2402.12941","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2024-02-20T11:53:08Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"0ab9b154dd5973f14836a86a618a16cf15be54479a9dea5ff5b11f15a8b44ab2","abstract_canon_sha256":"3a18ae9d69d24303543bf9adbdab679184b129cce6f7945dad9c2604e99ab10b"},"schema_version":"1.0"},"canonical_sha256":"bd21d7d925b75d0ada25e11e38a2b8fdf79f5086de309d6be55dbdaed6ccdeec","source":{"kind":"arxiv","id":"2402.12941","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2402.12941","created_at":"2026-07-05T07:47:18Z"},{"alias_kind":"arxiv_version","alias_value":"2402.12941v1","created_at":"2026-07-05T07:47:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2402.12941","created_at":"2026-07-05T07:47:18Z"},{"alias_kind":"pith_short_12","alias_value":"XUQ5PWJFW5OQ","created_at":"2026-07-05T07:47:18Z"},{"alias_kind":"pith_short_16","alias_value":"XUQ5PWJFW5OQVWRF","created_at":"2026-07-05T07:47:18Z"},{"alias_kind":"pith_short_8","alias_value":"XUQ5PWJF","created_at":"2026-07-05T07:47:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:XUQ5PWJFW5OQVWRF4EPDRIVY7X","target":"record","payload":{"canonical_record":{"source":{"id":"2402.12941","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2024-02-20T11:53:08Z","cross_cats_sorted":["cond-mat.str-el"],"title_canon_sha256":"0ab9b154dd5973f14836a86a618a16cf15be54479a9dea5ff5b11f15a8b44ab2","abstract_canon_sha256":"3a18ae9d69d24303543bf9adbdab679184b129cce6f7945dad9c2604e99ab10b"},"schema_version":"1.0"},"canonical_sha256":"bd21d7d925b75d0ada25e11e38a2b8fdf79f5086de309d6be55dbdaed6ccdeec","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:47:18.777782Z","signature_b64":"CKOKJXKhNoYg8zrhimeekiRYwSSVcwbKMX/ERx8r75JXEsw6j/nUB071t4J4QmmWNgp62hU9mgd+8zuhC67lCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bd21d7d925b75d0ada25e11e38a2b8fdf79f5086de309d6be55dbdaed6ccdeec","last_reissued_at":"2026-07-05T07:47:18.777242Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:47:18.777242Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2402.12941","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":"2026-07-05T07:47:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WSJFqcfKXiFnyPUESyatpeQK9fXM7mBDa5+AS8ht4C2lsJjpHh0ERLMs0VdLWNo0loGuJUKFBMcgb7XDuc+CCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T01:06:11.700685Z"},"content_sha256":"17c6aa96f9994da807dfcde4d761abf4ae20c8444ac024c4b7ed77bba411325f","schema_version":"1.0","event_id":"sha256:17c6aa96f9994da807dfcde4d761abf4ae20c8444ac024c4b7ed77bba411325f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:XUQ5PWJFW5OQVWRF4EPDRIVY7X","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Apparent color and Raman vibrational modes of the unconventional superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+\\delta}$ exfoliated flakes","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.supr-con","authors_text":"Adolfo del Campo, Aida Serrano, Elvira M. Gonz\\'alez, Gladys Nieva, Ignacio Figueruelo-Campanero, Mariela Menghini","submitted_at":"2024-02-20T11:53:08Z","abstract_excerpt":"Studying and controlling the properties of individual exfoliated materials is one of the first steps towards the fabrication of complex van der Waals systems. However, prolonged exposure to ambient conditions can affect the properties of very thin exfoliated materials altering their physical properties. For this reason, it is imperative to employ versatile characterization strategies compatible with reduced ambient exposure times. In this work, we demonstrate that optical microscopy and Raman spectroscopy are quick and non-invasive techniques to study flakes of the high-temperature superconduc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2402.12941","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/2402.12941/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":"2026-07-05T07:47:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FjqICYFn0ebY4nNVx7XE9sDUBnaoclwXyTDNeFVwmsLqqcbP3VbWTh73VOEJ0iQmxU2Xe5xqg7RgdxB/xa3fCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T01:06:11.701624Z"},"content_sha256":"3925a63733358589ae48a55a98cb03af592af3f840a9e0b7a1ea3119ee0d7f67","schema_version":"1.0","event_id":"sha256:3925a63733358589ae48a55a98cb03af592af3f840a9e0b7a1ea3119ee0d7f67"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XUQ5PWJFW5OQVWRF4EPDRIVY7X/bundle.json","state_url":"https://pith.science/pith/XUQ5PWJFW5OQVWRF4EPDRIVY7X/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XUQ5PWJFW5OQVWRF4EPDRIVY7X/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":"2026-08-17T01:06:11Z","links":{"resolver":"https://pith.science/pith/XUQ5PWJFW5OQVWRF4EPDRIVY7X","bundle":"https://pith.science/pith/XUQ5PWJFW5OQVWRF4EPDRIVY7X/bundle.json","state":"https://pith.science/pith/XUQ5PWJFW5OQVWRF4EPDRIVY7X/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XUQ5PWJFW5OQVWRF4EPDRIVY7X/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:XUQ5PWJFW5OQVWRF4EPDRIVY7X","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":"3a18ae9d69d24303543bf9adbdab679184b129cce6f7945dad9c2604e99ab10b","cross_cats_sorted":["cond-mat.str-el"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2024-02-20T11:53:08Z","title_canon_sha256":"0ab9b154dd5973f14836a86a618a16cf15be54479a9dea5ff5b11f15a8b44ab2"},"schema_version":"1.0","source":{"id":"2402.12941","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2402.12941","created_at":"2026-07-05T07:47:18Z"},{"alias_kind":"arxiv_version","alias_value":"2402.12941v1","created_at":"2026-07-05T07:47:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2402.12941","created_at":"2026-07-05T07:47:18Z"},{"alias_kind":"pith_short_12","alias_value":"XUQ5PWJFW5OQ","created_at":"2026-07-05T07:47:18Z"},{"alias_kind":"pith_short_16","alias_value":"XUQ5PWJFW5OQVWRF","created_at":"2026-07-05T07:47:18Z"},{"alias_kind":"pith_short_8","alias_value":"XUQ5PWJF","created_at":"2026-07-05T07:47:18Z"}],"graph_snapshots":[{"event_id":"sha256:3925a63733358589ae48a55a98cb03af592af3f840a9e0b7a1ea3119ee0d7f67","target":"graph","created_at":"2026-07-05T07:47:18Z","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/2402.12941/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Studying and controlling the properties of individual exfoliated materials is one of the first steps towards the fabrication of complex van der Waals systems. However, prolonged exposure to ambient conditions can affect the properties of very thin exfoliated materials altering their physical properties. For this reason, it is imperative to employ versatile characterization strategies compatible with reduced ambient exposure times. In this work, we demonstrate that optical microscopy and Raman spectroscopy are quick and non-invasive techniques to study flakes of the high-temperature superconduc","authors_text":"Adolfo del Campo, Aida Serrano, Elvira M. Gonz\\'alez, Gladys Nieva, Ignacio Figueruelo-Campanero, Mariela Menghini","cross_cats":["cond-mat.str-el"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2024-02-20T11:53:08Z","title":"Apparent color and Raman vibrational modes of the unconventional superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+\\delta}$ exfoliated flakes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2402.12941","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":"sha256:17c6aa96f9994da807dfcde4d761abf4ae20c8444ac024c4b7ed77bba411325f","target":"record","created_at":"2026-07-05T07:47:18Z","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":"3a18ae9d69d24303543bf9adbdab679184b129cce6f7945dad9c2604e99ab10b","cross_cats_sorted":["cond-mat.str-el"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2024-02-20T11:53:08Z","title_canon_sha256":"0ab9b154dd5973f14836a86a618a16cf15be54479a9dea5ff5b11f15a8b44ab2"},"schema_version":"1.0","source":{"id":"2402.12941","kind":"arxiv","version":1}},"canonical_sha256":"bd21d7d925b75d0ada25e11e38a2b8fdf79f5086de309d6be55dbdaed6ccdeec","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bd21d7d925b75d0ada25e11e38a2b8fdf79f5086de309d6be55dbdaed6ccdeec","first_computed_at":"2026-07-05T07:47:18.777242Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:47:18.777242Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CKOKJXKhNoYg8zrhimeekiRYwSSVcwbKMX/ERx8r75JXEsw6j/nUB071t4J4QmmWNgp62hU9mgd+8zuhC67lCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T07:47:18.777782Z","signed_message":"canonical_sha256_bytes"},"source_id":"2402.12941","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:17c6aa96f9994da807dfcde4d761abf4ae20c8444ac024c4b7ed77bba411325f","sha256:3925a63733358589ae48a55a98cb03af592af3f840a9e0b7a1ea3119ee0d7f67"],"state_sha256":"5046e9efd34eee9c85cd6555b9a19415f0a094a1443da7a31b57523db101140d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fuY8eYNn9NrJ4+kh1p9CwCYhyoFlgk+0CyLMaqF5ku5hB5Sx4Ac46bGAMJzSM3lTRdpHNp7E9ZG3ZsIE62HABg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-17T01:06:11.710182Z","bundle_sha256":"ef5b45434c45aca55cb861491c8b8b801c0868621483f0dd489b1b2fe93a638f"}}