{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:TML42YSIEYS675UKAI6EE35OL7","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":"f499f155565638855e26d6a6aa1f64a0f9131f3cc55eca358622e47a78545d4a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-11-21T18:26:32Z","title_canon_sha256":"4ea6a6492f047e9f9a646873f184502edcecfd34b361f12daab239c92fb7f1fb"},"schema_version":"1.0","source":{"id":"1811.08867","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.08867","created_at":"2026-05-17T23:51:48Z"},{"alias_kind":"arxiv_version","alias_value":"1811.08867v1","created_at":"2026-05-17T23:51:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.08867","created_at":"2026-05-17T23:51:48Z"},{"alias_kind":"pith_short_12","alias_value":"TML42YSIEYS6","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"TML42YSIEYS675UK","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"TML42YSI","created_at":"2026-05-18T12:32:53Z"}],"graph_snapshots":[{"event_id":"sha256:a607d651368e8db96c8fea0c66b859ece9f1bc4a2b0d28ade0decb5fe8f899ef","target":"graph","created_at":"2026-05-17T23:51:48Z","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":"Here we show that addition of Hf to Nb4Ta can significantly improve the high field performance of Nb$_{3}$Sn, making it suitable for dipole magnets for Future Circular Collider (FCC). A big challenge for the FCC is that a realistic production target for FCC Nb3Sn requires ~30% improvement over current conductor performance. Recent success with internal oxidation(IO) of Nb-Zr precursor has shown significant improvement in the layer J$_{c}$ of Nb$_{3}$Sn wires, albeit the complication of providing an internal O$_{2}$ diffusion path and avoiding degradation of irreversibility field($_{irr}$). We ","authors_text":"Benjamin Walker, Chiara Tarantini, David C. Larbalestier, Fumitake Kametani, Peter J. Lee, Shreyas Balachandran, William L. Starch, Yi-Feng Su","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-11-21T18:26:32Z","title":"Beneficial influence of Hf and Zr additions to Nb4at.%Ta on the vortex pinning of Nb$_{3}$Sn with and without an O source"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.08867","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:bc30a3cd6a707e7098b3d12566f2ad21c5e151c0283d880e4f8dcade58c95f56","target":"record","created_at":"2026-05-17T23:51:48Z","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":"f499f155565638855e26d6a6aa1f64a0f9131f3cc55eca358622e47a78545d4a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2018-11-21T18:26:32Z","title_canon_sha256":"4ea6a6492f047e9f9a646873f184502edcecfd34b361f12daab239c92fb7f1fb"},"schema_version":"1.0","source":{"id":"1811.08867","kind":"arxiv","version":1}},"canonical_sha256":"9b17cd62482625eff68a023c426fae5fe3b8429372e0d80bc9a73e11768f8ddf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9b17cd62482625eff68a023c426fae5fe3b8429372e0d80bc9a73e11768f8ddf","first_computed_at":"2026-05-17T23:51:48.872063Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:51:48.872063Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dea1YoVtYXUnZxmyP7Gc0L+Eq/i6Y90ObpUVEYbc2vJpkRSE6r8B2cK2Rl134rfq4vvif1T3RiPJfwwFxNDlBg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:51:48.872694Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.08867","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bc30a3cd6a707e7098b3d12566f2ad21c5e151c0283d880e4f8dcade58c95f56","sha256:a607d651368e8db96c8fea0c66b859ece9f1bc4a2b0d28ade0decb5fe8f899ef"],"state_sha256":"9559f59aea54a22be5eafe78a9a4c3373aada694b8b906b3a36c77cb62a1545a"}