{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:LRJQWQNFXDD2JOGHMKFFGO2ADP","short_pith_number":"pith:LRJQWQNF","canonical_record":{"source":{"id":"cond-mat/0307445","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2003-07-17T21:42:20Z","cross_cats_sorted":[],"title_canon_sha256":"5a99f013952b9ee718da230540f6bc0e5816b8b388ab923e407c52f607de0fcb","abstract_canon_sha256":"b5ff5ca425836ef21703ef411b64a26f8722440b29134a9f8757cbda576f2545"},"schema_version":"1.0"},"canonical_sha256":"5c530b41a5b8c7a4b8c7628a533b401bf27652e14ec8edd3f18ee59f1d31e9af","source":{"kind":"arxiv","id":"cond-mat/0307445","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/0307445","created_at":"2026-05-18T04:00:38Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/0307445v1","created_at":"2026-05-18T04:00:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/0307445","created_at":"2026-05-18T04:00:38Z"},{"alias_kind":"pith_short_12","alias_value":"LRJQWQNFXDD2","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"LRJQWQNFXDD2JOGH","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"LRJQWQNF","created_at":"2026-05-18T12:25:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:LRJQWQNFXDD2JOGHMKFFGO2ADP","target":"record","payload":{"canonical_record":{"source":{"id":"cond-mat/0307445","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2003-07-17T21:42:20Z","cross_cats_sorted":[],"title_canon_sha256":"5a99f013952b9ee718da230540f6bc0e5816b8b388ab923e407c52f607de0fcb","abstract_canon_sha256":"b5ff5ca425836ef21703ef411b64a26f8722440b29134a9f8757cbda576f2545"},"schema_version":"1.0"},"canonical_sha256":"5c530b41a5b8c7a4b8c7628a533b401bf27652e14ec8edd3f18ee59f1d31e9af","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:00:38.334445Z","signature_b64":"6NIgd3SkE6AMpM01LG5Ka1iQY39onbL4+WG5d46HU+G9GbvG4xLgy2kKretTDXQyGLR9QB15E//OtCZ/OCLLAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5c530b41a5b8c7a4b8c7628a533b401bf27652e14ec8edd3f18ee59f1d31e9af","last_reissued_at":"2026-05-18T04:00:38.333715Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:00:38.333715Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"cond-mat/0307445","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":"2026-05-18T04:00:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"prO9bs7iNzHK5EwGhpzlHXqdOBS7OUTnx2QpL6wcG0v0kN56HayZAI+YAVaIUuUrMFOw36s04LDnkiPpEUK9AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T19:37:56.316973Z"},"content_sha256":"47cc5a0616ad4406de941c608085e36b2282c1992f9e1a9e938fff2f02192d46","schema_version":"1.0","event_id":"sha256:47cc5a0616ad4406de941c608085e36b2282c1992f9e1a9e938fff2f02192d46"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:LRJQWQNFXDD2JOGHMKFFGO2ADP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Surface Contribution to the Superconducting Properties of MgB2 Single Crystals","license":"","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"A. Koshelev, A. Rydh, B. Kang, C. U. Jung, G. W. Crabtree, H.-S. Lee, J. M. Hiller, K. H. P. Kim, S.-I. Lee, U. Welp, W. K. Kwok","submitted_at":"2003-07-17T21:42:20Z","abstract_excerpt":"We demonstrate direct evidence of possible surface superconductivity on small, well-shaped MgB2 single crystals. Transport measurements in the range H < 1.6 Hc2^c, where Hc2^c is the bulk upper critical field for the c axis, show non-Ohmic and strongly angular dependent resistivity. Studies of the alignment of H with selected crystal surfaces, transport and specific heat measurements on the same crystal, and a physical sculpturing of the crystal surfaces using a focused ion beam all support the conclusion. Similar, albeit less pronounced results are obtained for fields in the basal plane."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0307445","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":"2026-05-18T04:00:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e3lRR09Ofuegy4z1rISY5BF0v2mp5jE+X9ew+56ISXMamvLX4N5cWWMgH80ZUzgAm0+M81viaE+4ywbffYOdBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T19:37:56.317531Z"},"content_sha256":"acee6670fdfbf91fe29ec9f4837d135af353f5bef16afe1069e6d11728e4af50","schema_version":"1.0","event_id":"sha256:acee6670fdfbf91fe29ec9f4837d135af353f5bef16afe1069e6d11728e4af50"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LRJQWQNFXDD2JOGHMKFFGO2ADP/bundle.json","state_url":"https://pith.science/pith/LRJQWQNFXDD2JOGHMKFFGO2ADP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LRJQWQNFXDD2JOGHMKFFGO2ADP/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":"2026-05-19T19:37:56Z","links":{"resolver":"https://pith.science/pith/LRJQWQNFXDD2JOGHMKFFGO2ADP","bundle":"https://pith.science/pith/LRJQWQNFXDD2JOGHMKFFGO2ADP/bundle.json","state":"https://pith.science/pith/LRJQWQNFXDD2JOGHMKFFGO2ADP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LRJQWQNFXDD2JOGHMKFFGO2ADP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:LRJQWQNFXDD2JOGHMKFFGO2ADP","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":"b5ff5ca425836ef21703ef411b64a26f8722440b29134a9f8757cbda576f2545","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2003-07-17T21:42:20Z","title_canon_sha256":"5a99f013952b9ee718da230540f6bc0e5816b8b388ab923e407c52f607de0fcb"},"schema_version":"1.0","source":{"id":"cond-mat/0307445","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/0307445","created_at":"2026-05-18T04:00:38Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/0307445v1","created_at":"2026-05-18T04:00:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/0307445","created_at":"2026-05-18T04:00:38Z"},{"alias_kind":"pith_short_12","alias_value":"LRJQWQNFXDD2","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"LRJQWQNFXDD2JOGH","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"LRJQWQNF","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:acee6670fdfbf91fe29ec9f4837d135af353f5bef16afe1069e6d11728e4af50","target":"graph","created_at":"2026-05-18T04:00:38Z","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":"We demonstrate direct evidence of possible surface superconductivity on small, well-shaped MgB2 single crystals. Transport measurements in the range H < 1.6 Hc2^c, where Hc2^c is the bulk upper critical field for the c axis, show non-Ohmic and strongly angular dependent resistivity. Studies of the alignment of H with selected crystal surfaces, transport and specific heat measurements on the same crystal, and a physical sculpturing of the crystal surfaces using a focused ion beam all support the conclusion. Similar, albeit less pronounced results are obtained for fields in the basal plane.","authors_text":"A. Koshelev, A. Rydh, B. Kang, C. U. Jung, G. W. Crabtree, H.-S. Lee, J. M. Hiller, K. H. P. Kim, S.-I. Lee, U. Welp, W. K. Kwok","cross_cats":[],"headline":"","license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2003-07-17T21:42:20Z","title":"Surface Contribution to the Superconducting Properties of MgB2 Single Crystals"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0307445","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":"sha256:47cc5a0616ad4406de941c608085e36b2282c1992f9e1a9e938fff2f02192d46","target":"record","created_at":"2026-05-18T04:00:38Z","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":"b5ff5ca425836ef21703ef411b64a26f8722440b29134a9f8757cbda576f2545","cross_cats_sorted":[],"license":"","primary_cat":"cond-mat.supr-con","submitted_at":"2003-07-17T21:42:20Z","title_canon_sha256":"5a99f013952b9ee718da230540f6bc0e5816b8b388ab923e407c52f607de0fcb"},"schema_version":"1.0","source":{"id":"cond-mat/0307445","kind":"arxiv","version":1}},"canonical_sha256":"5c530b41a5b8c7a4b8c7628a533b401bf27652e14ec8edd3f18ee59f1d31e9af","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5c530b41a5b8c7a4b8c7628a533b401bf27652e14ec8edd3f18ee59f1d31e9af","first_computed_at":"2026-05-18T04:00:38.333715Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:00:38.333715Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6NIgd3SkE6AMpM01LG5Ka1iQY39onbL4+WG5d46HU+G9GbvG4xLgy2kKretTDXQyGLR9QB15E//OtCZ/OCLLAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:00:38.334445Z","signed_message":"canonical_sha256_bytes"},"source_id":"cond-mat/0307445","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:47cc5a0616ad4406de941c608085e36b2282c1992f9e1a9e938fff2f02192d46","sha256:acee6670fdfbf91fe29ec9f4837d135af353f5bef16afe1069e6d11728e4af50"],"state_sha256":"6d3dad90bdef49f5f60b8a666e8d22d71641a1a8892e8865c18fedc106a1f217"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eNxykktJRMOmtcbc7IMYmNV1hRO15zGvJhzyKglP6Z7SHZgoGXCHri0NPNafcmLQCn+KKGQ2M4Eti002ESRpAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T19:37:56.319880Z","bundle_sha256":"f4ffc61d2b3f0f1d336e9ec1c3fbcf1bb67cc25e504a4a11ab95f423e3cd5b7a"}}