{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:S7MDAGHHJBPGR6DPSY6ZIZ53PV","short_pith_number":"pith:S7MDAGHH","canonical_record":{"source":{"id":"1012.1446","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2010-12-07T10:24:59Z","cross_cats_sorted":[],"title_canon_sha256":"2a99c0945b929d402810870ba61ff493d516cd9c3fc3c6d70080d25928a20dda","abstract_canon_sha256":"24d70ac2a52abc40c0b5a13c8e7b35b72758ff6428f4c8f9e910ab5ecece6bc9"},"schema_version":"1.0"},"canonical_sha256":"97d83018e7485e68f86f963d9467bb7d419303dfc6551b762bf1f75d991b097b","source":{"kind":"arxiv","id":"1012.1446","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1012.1446","created_at":"2026-05-18T04:34:01Z"},{"alias_kind":"arxiv_version","alias_value":"1012.1446v1","created_at":"2026-05-18T04:34:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1012.1446","created_at":"2026-05-18T04:34:01Z"},{"alias_kind":"pith_short_12","alias_value":"S7MDAGHHJBPG","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"S7MDAGHHJBPGR6DP","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"S7MDAGHH","created_at":"2026-05-18T12:26:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:S7MDAGHHJBPGR6DPSY6ZIZ53PV","target":"record","payload":{"canonical_record":{"source":{"id":"1012.1446","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2010-12-07T10:24:59Z","cross_cats_sorted":[],"title_canon_sha256":"2a99c0945b929d402810870ba61ff493d516cd9c3fc3c6d70080d25928a20dda","abstract_canon_sha256":"24d70ac2a52abc40c0b5a13c8e7b35b72758ff6428f4c8f9e910ab5ecece6bc9"},"schema_version":"1.0"},"canonical_sha256":"97d83018e7485e68f86f963d9467bb7d419303dfc6551b762bf1f75d991b097b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:34:01.058131Z","signature_b64":"K5thy3hgPSVW/74/snoB/rHHczRoV4pqrRXMzxsD3cK7OGTLGSr873LpmIh9uuNr6bQabcqizMaL3nRn/di3BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"97d83018e7485e68f86f963d9467bb7d419303dfc6551b762bf1f75d991b097b","last_reissued_at":"2026-05-18T04:34:01.057635Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:34:01.057635Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1012.1446","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":"2026-05-18T04:34:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0rlsDiZiXb6H6/QQ5cYqKgYyofK198A625nrDoIR4Nzy9j8aqskuBkut9iBqBA/JnhboVSQ12vn5Udez8FCwCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T23:41:16.553271Z"},"content_sha256":"863ed3dac1642e35f28fa7d83d4903e7c1f4e146aedb12e5db7535825408cc92","schema_version":"1.0","event_id":"sha256:863ed3dac1642e35f28fa7d83d4903e7c1f4e146aedb12e5db7535825408cc92"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:S7MDAGHHJBPGR6DPSY6ZIZ53PV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observation of shell effects in superconducting nanoparticles of Sn","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Antonio M. Garc\\'ia-Garc\\'ia, Christian H. Michaelis, Ivan Brihuega, Juan D. Urbina, Klaus Kern, Miguel M. Ugeda, Sangita Bose","submitted_at":"2010-12-07T10:24:59Z","abstract_excerpt":"In a zero-dimensional superconductor, quantum size effects(QSE) not only set the limit to superconductivity, but are also at the heart of new phenomena such as shell effects, which have been predicted to result in large enhancements of the superconducting energy gap. Here, we experimentally demonstrate these QSE through measurements on single, isolated Pb and Sn nanoparticles. In both systems superconductivity is ultimately quenched at sizes governed by the dominance of the quantum fluctuations of the order parameter. However, before the destruction of superconductivity, in Sn nanoparticles we"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1012.1446","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":"2026-05-18T04:34:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rzLQ8QShvSoVqcvS5RKzhSfAZElyfL8+5pXELiOl2MKeA7LKxTvR7JVpF0+P9EuBAXQk9cT6d+743AKOVNNsCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T23:41:16.554063Z"},"content_sha256":"504708fef64abac3c31823be54e5d918d72f4634b3d047edae903feca65928c4","schema_version":"1.0","event_id":"sha256:504708fef64abac3c31823be54e5d918d72f4634b3d047edae903feca65928c4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/S7MDAGHHJBPGR6DPSY6ZIZ53PV/bundle.json","state_url":"https://pith.science/pith/S7MDAGHHJBPGR6DPSY6ZIZ53PV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/S7MDAGHHJBPGR6DPSY6ZIZ53PV/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":"2026-05-28T23:41:16Z","links":{"resolver":"https://pith.science/pith/S7MDAGHHJBPGR6DPSY6ZIZ53PV","bundle":"https://pith.science/pith/S7MDAGHHJBPGR6DPSY6ZIZ53PV/bundle.json","state":"https://pith.science/pith/S7MDAGHHJBPGR6DPSY6ZIZ53PV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/S7MDAGHHJBPGR6DPSY6ZIZ53PV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:S7MDAGHHJBPGR6DPSY6ZIZ53PV","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":"24d70ac2a52abc40c0b5a13c8e7b35b72758ff6428f4c8f9e910ab5ecece6bc9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2010-12-07T10:24:59Z","title_canon_sha256":"2a99c0945b929d402810870ba61ff493d516cd9c3fc3c6d70080d25928a20dda"},"schema_version":"1.0","source":{"id":"1012.1446","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1012.1446","created_at":"2026-05-18T04:34:01Z"},{"alias_kind":"arxiv_version","alias_value":"1012.1446v1","created_at":"2026-05-18T04:34:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1012.1446","created_at":"2026-05-18T04:34:01Z"},{"alias_kind":"pith_short_12","alias_value":"S7MDAGHHJBPG","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_16","alias_value":"S7MDAGHHJBPGR6DP","created_at":"2026-05-18T12:26:13Z"},{"alias_kind":"pith_short_8","alias_value":"S7MDAGHH","created_at":"2026-05-18T12:26:13Z"}],"graph_snapshots":[{"event_id":"sha256:504708fef64abac3c31823be54e5d918d72f4634b3d047edae903feca65928c4","target":"graph","created_at":"2026-05-18T04:34:01Z","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":"In a zero-dimensional superconductor, quantum size effects(QSE) not only set the limit to superconductivity, but are also at the heart of new phenomena such as shell effects, which have been predicted to result in large enhancements of the superconducting energy gap. Here, we experimentally demonstrate these QSE through measurements on single, isolated Pb and Sn nanoparticles. In both systems superconductivity is ultimately quenched at sizes governed by the dominance of the quantum fluctuations of the order parameter. However, before the destruction of superconductivity, in Sn nanoparticles we","authors_text":"Antonio M. Garc\\'ia-Garc\\'ia, Christian H. Michaelis, Ivan Brihuega, Juan D. Urbina, Klaus Kern, Miguel M. Ugeda, Sangita Bose","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2010-12-07T10:24:59Z","title":"Observation of shell effects in superconducting nanoparticles of Sn"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1012.1446","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":"sha256:863ed3dac1642e35f28fa7d83d4903e7c1f4e146aedb12e5db7535825408cc92","target":"record","created_at":"2026-05-18T04:34:01Z","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":"24d70ac2a52abc40c0b5a13c8e7b35b72758ff6428f4c8f9e910ab5ecece6bc9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2010-12-07T10:24:59Z","title_canon_sha256":"2a99c0945b929d402810870ba61ff493d516cd9c3fc3c6d70080d25928a20dda"},"schema_version":"1.0","source":{"id":"1012.1446","kind":"arxiv","version":1}},"canonical_sha256":"97d83018e7485e68f86f963d9467bb7d419303dfc6551b762bf1f75d991b097b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"97d83018e7485e68f86f963d9467bb7d419303dfc6551b762bf1f75d991b097b","first_computed_at":"2026-05-18T04:34:01.057635Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:34:01.057635Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K5thy3hgPSVW/74/snoB/rHHczRoV4pqrRXMzxsD3cK7OGTLGSr873LpmIh9uuNr6bQabcqizMaL3nRn/di3BA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:34:01.058131Z","signed_message":"canonical_sha256_bytes"},"source_id":"1012.1446","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:863ed3dac1642e35f28fa7d83d4903e7c1f4e146aedb12e5db7535825408cc92","sha256:504708fef64abac3c31823be54e5d918d72f4634b3d047edae903feca65928c4"],"state_sha256":"cd3aa62efe3a6857b0cdc5f9a1718be37ca2b0141621793a5ff84a496a1af70e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MzvIbTzHfJ+XATwIWAR52zP1Vt1mvQFU5sfFqK5MIxwpgjCIYanniyPdE2nCNfpSZI46HPmSxUKKPY8gDHXQCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T23:41:16.557899Z","bundle_sha256":"e92630832a044fba0cf5bc3b37e3bb3292f479dd99281420a9de0a15f0de58d4"}}