{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:FW33JLLINUEO55WVT6CAVFUIJE","short_pith_number":"pith:FW33JLLI","canonical_record":{"source":{"id":"1901.08039","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-01-23T18:41:18Z","cross_cats_sorted":[],"title_canon_sha256":"8a27ccd81f4f97771b19546f77784ca25ee6aa80fa27fbecce47ad88063f2fef","abstract_canon_sha256":"8337a4e6f3294efdad6e30544e7bfd3279f17a67fd651aedaeeb2b4c9523179a"},"schema_version":"1.0"},"canonical_sha256":"2db7b4ad686d08eef6d59f840a9688490ce761f8ccc23bafc3a406b560b7033e","source":{"kind":"arxiv","id":"1901.08039","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.08039","created_at":"2026-05-17T23:47:35Z"},{"alias_kind":"arxiv_version","alias_value":"1901.08039v3","created_at":"2026-05-17T23:47:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.08039","created_at":"2026-05-17T23:47:35Z"},{"alias_kind":"pith_short_12","alias_value":"FW33JLLINUEO","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"FW33JLLINUEO55WV","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"FW33JLLI","created_at":"2026-05-18T12:33:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:FW33JLLINUEO55WVT6CAVFUIJE","target":"record","payload":{"canonical_record":{"source":{"id":"1901.08039","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-01-23T18:41:18Z","cross_cats_sorted":[],"title_canon_sha256":"8a27ccd81f4f97771b19546f77784ca25ee6aa80fa27fbecce47ad88063f2fef","abstract_canon_sha256":"8337a4e6f3294efdad6e30544e7bfd3279f17a67fd651aedaeeb2b4c9523179a"},"schema_version":"1.0"},"canonical_sha256":"2db7b4ad686d08eef6d59f840a9688490ce761f8ccc23bafc3a406b560b7033e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:47:35.801719Z","signature_b64":"ftviQYpiXfysejblEbNVtlBmnd9xjXPCyvqjoRWPZMeZmpGA4JJoMYEtiFwsNQjj3ajSiS8+WP6rpgitJEeoAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2db7b4ad686d08eef6d59f840a9688490ce761f8ccc23bafc3a406b560b7033e","last_reissued_at":"2026-05-17T23:47:35.801257Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:47:35.801257Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.08039","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:47:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M0paZ6wkXOxvbL3TazgpoRRrrHlBLUpXvpismbCAEJDfQi8m7DOkkfnlQCXMm3CB8BPBbJfsSmQ6+cc4tsr7CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T23:59:48.742386Z"},"content_sha256":"e74e1027340a42cfd23347337cd85b49d5260ac9ac982024f3973acd3cf39153","schema_version":"1.0","event_id":"sha256:e74e1027340a42cfd23347337cd85b49d5260ac9ac982024f3973acd3cf39153"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:FW33JLLINUEO55WVT6CAVFUIJE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Josephson junctions and SQUIDs created by focused helium ion beam irradiation of YBa$_2$Cu$_3$O$_7$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"B. M\\\"uller, B. Schr\\\"oppel, C. J. Burkhardt, D. Koelle, E. Goldobin, F. Limberger, M. Becker, M. Karrer, R. Kleiner","submitted_at":"2019-01-23T18:41:18Z","abstract_excerpt":"By scanning with a $30\\, \\mathrm{keV}$ focused He ion beam (He-FIB) across YBa$_2$Cu$_3$O$_7$ (YBCO) thin film microbridges, we create Josephson barriers with critical current density $j_\\mathrm{c}$ adjustable by irradiation dose $D$. The dependence $j_\\mathrm{c} (D)$ yields an exponential decay. At $4.2\\, \\mathrm{K}$, a transition from flux-flow to Josephson behavior occurs when $j_\\mathrm{c}$ decreases below $\\approx 2\\, \\mathrm{MA/cm^2}$. The Josephson junctions exhibit current-voltage characteristics (IVCs) that are well described by the resistively and capacitively shunted junction model,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.08039","kind":"arxiv","version":3},"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":"2026-05-17T23:47:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H/SNswG0AFfOtGyPVgcovtyTFxZLh0wDCPbUzErULyNXcS0LICZihbd1LVazJzufXCAXAu6QpUJRJ+nkReERBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T23:59:48.743048Z"},"content_sha256":"80888d005514ab4c327bf9b2baf3a41a2764805497e97ab0a0288f5e28006051","schema_version":"1.0","event_id":"sha256:80888d005514ab4c327bf9b2baf3a41a2764805497e97ab0a0288f5e28006051"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FW33JLLINUEO55WVT6CAVFUIJE/bundle.json","state_url":"https://pith.science/pith/FW33JLLINUEO55WVT6CAVFUIJE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FW33JLLINUEO55WVT6CAVFUIJE/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":"2026-05-26T23:59:48Z","links":{"resolver":"https://pith.science/pith/FW33JLLINUEO55WVT6CAVFUIJE","bundle":"https://pith.science/pith/FW33JLLINUEO55WVT6CAVFUIJE/bundle.json","state":"https://pith.science/pith/FW33JLLINUEO55WVT6CAVFUIJE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FW33JLLINUEO55WVT6CAVFUIJE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:FW33JLLINUEO55WVT6CAVFUIJE","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":"8337a4e6f3294efdad6e30544e7bfd3279f17a67fd651aedaeeb2b4c9523179a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-01-23T18:41:18Z","title_canon_sha256":"8a27ccd81f4f97771b19546f77784ca25ee6aa80fa27fbecce47ad88063f2fef"},"schema_version":"1.0","source":{"id":"1901.08039","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.08039","created_at":"2026-05-17T23:47:35Z"},{"alias_kind":"arxiv_version","alias_value":"1901.08039v3","created_at":"2026-05-17T23:47:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.08039","created_at":"2026-05-17T23:47:35Z"},{"alias_kind":"pith_short_12","alias_value":"FW33JLLINUEO","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"FW33JLLINUEO55WV","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"FW33JLLI","created_at":"2026-05-18T12:33:15Z"}],"graph_snapshots":[{"event_id":"sha256:80888d005514ab4c327bf9b2baf3a41a2764805497e97ab0a0288f5e28006051","target":"graph","created_at":"2026-05-17T23:47:35Z","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":"By scanning with a $30\\, \\mathrm{keV}$ focused He ion beam (He-FIB) across YBa$_2$Cu$_3$O$_7$ (YBCO) thin film microbridges, we create Josephson barriers with critical current density $j_\\mathrm{c}$ adjustable by irradiation dose $D$. The dependence $j_\\mathrm{c} (D)$ yields an exponential decay. At $4.2\\, \\mathrm{K}$, a transition from flux-flow to Josephson behavior occurs when $j_\\mathrm{c}$ decreases below $\\approx 2\\, \\mathrm{MA/cm^2}$. The Josephson junctions exhibit current-voltage characteristics (IVCs) that are well described by the resistively and capacitively shunted junction model,","authors_text":"B. M\\\"uller, B. Schr\\\"oppel, C. J. Burkhardt, D. Koelle, E. Goldobin, F. Limberger, M. Becker, M. Karrer, R. Kleiner","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-01-23T18:41:18Z","title":"Josephson junctions and SQUIDs created by focused helium ion beam irradiation of YBa$_2$Cu$_3$O$_7$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.08039","kind":"arxiv","version":3},"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:e74e1027340a42cfd23347337cd85b49d5260ac9ac982024f3973acd3cf39153","target":"record","created_at":"2026-05-17T23:47:35Z","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":"8337a4e6f3294efdad6e30544e7bfd3279f17a67fd651aedaeeb2b4c9523179a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2019-01-23T18:41:18Z","title_canon_sha256":"8a27ccd81f4f97771b19546f77784ca25ee6aa80fa27fbecce47ad88063f2fef"},"schema_version":"1.0","source":{"id":"1901.08039","kind":"arxiv","version":3}},"canonical_sha256":"2db7b4ad686d08eef6d59f840a9688490ce761f8ccc23bafc3a406b560b7033e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2db7b4ad686d08eef6d59f840a9688490ce761f8ccc23bafc3a406b560b7033e","first_computed_at":"2026-05-17T23:47:35.801257Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:47:35.801257Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ftviQYpiXfysejblEbNVtlBmnd9xjXPCyvqjoRWPZMeZmpGA4JJoMYEtiFwsNQjj3ajSiS8+WP6rpgitJEeoAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:47:35.801719Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.08039","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e74e1027340a42cfd23347337cd85b49d5260ac9ac982024f3973acd3cf39153","sha256:80888d005514ab4c327bf9b2baf3a41a2764805497e97ab0a0288f5e28006051"],"state_sha256":"fb5dd441e49360acdacb4c98530254138a36ddcc29d3688767ac69192a6c4351"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2uDdxl7UaPAz5mAv83hL1JeeY6SNzLU25M4kA/DGz862V67XhIV8TZtKjdx11cFiUhqOJtJDtnReZTkmu/vEDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T23:59:48.746668Z","bundle_sha256":"7e97c02996b66f3861ccb1f0f06eeec64665247fdebe71c4578e0e2dc96ae7fa"}}