{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:ITXLFJXL5ZJGFMDRCMKKCQS6PO","short_pith_number":"pith:ITXLFJXL","canonical_record":{"source":{"id":"1510.02234","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2015-10-08T08:41:19Z","cross_cats_sorted":[],"title_canon_sha256":"969771c683d82603502fb08429d9b19dd0cb07fd1d0fb95641422eb756138c30","abstract_canon_sha256":"9966fdd9576f31cd3f3808fa5a561851c6649976794da725ed212831ca25efc3"},"schema_version":"1.0"},"canonical_sha256":"44eeb2a6ebee5262b0711314a1425e7bbe0b1e977b3bb2d35fb02e725beccf34","source":{"kind":"arxiv","id":"1510.02234","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.02234","created_at":"2026-05-18T01:24:38Z"},{"alias_kind":"arxiv_version","alias_value":"1510.02234v2","created_at":"2026-05-18T01:24:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.02234","created_at":"2026-05-18T01:24:38Z"},{"alias_kind":"pith_short_12","alias_value":"ITXLFJXL5ZJG","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"ITXLFJXL5ZJGFMDR","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"ITXLFJXL","created_at":"2026-05-18T12:29:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:ITXLFJXL5ZJGFMDRCMKKCQS6PO","target":"record","payload":{"canonical_record":{"source":{"id":"1510.02234","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2015-10-08T08:41:19Z","cross_cats_sorted":[],"title_canon_sha256":"969771c683d82603502fb08429d9b19dd0cb07fd1d0fb95641422eb756138c30","abstract_canon_sha256":"9966fdd9576f31cd3f3808fa5a561851c6649976794da725ed212831ca25efc3"},"schema_version":"1.0"},"canonical_sha256":"44eeb2a6ebee5262b0711314a1425e7bbe0b1e977b3bb2d35fb02e725beccf34","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:24:38.106712Z","signature_b64":"enPyqXg02qN5GGtQ+v02mXLGG8s99tTafV1ipuUsNExbchWLOpDq+uq3Lw0Uyd6ae/KVSAu4zDU+67GhZb6FBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"44eeb2a6ebee5262b0711314a1425e7bbe0b1e977b3bb2d35fb02e725beccf34","last_reissued_at":"2026-05-18T01:24:38.106218Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:24:38.106218Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.02234","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:24:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V4UReXa8Y1yTJaFfchLnDoIMAS/akjsdRNOe5KaQ6G5NhmPyFlmK4ZseOxoUa/KNzd7C+ZeQMfnMRNCHbUGOBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T03:26:36.684206Z"},"content_sha256":"5801d020ef871c302adacf1d2825fcfb4b73c397af2fb8c819abe4a5e843d007","schema_version":"1.0","event_id":"sha256:5801d020ef871c302adacf1d2825fcfb4b73c397af2fb8c819abe4a5e843d007"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:ITXLFJXL5ZJGFMDRCMKKCQS6PO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Improving the critical temperature of MgB2 superconducting metamaterials induced by electroluminescence","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Guowei Chen, Shuo Tao, Xiaopeng Zhao, Zhiwei Zhang","submitted_at":"2015-10-08T08:41:19Z","abstract_excerpt":"The MgB2 superconductor was doped with electroluminescent Y2O3:Eu, to synthesise a superconducting metamaterial. The temperature dependence of the resistivity of the superconductor indicates that the critical temperature (TC) of samples decrease when increasing the amount of doped Y2O3 nanorods, due to impurity (Y2O3, MgO and YB4). However, the TC of the samples increase with increasing amount of doped Y2O3:Eu3+ nanorods, which are opposite to doped Y2O3 nanorods. Moreover, the transition temperature of the sample doped with 8 wt. % Y2O3:Eu3+ nanorods is higher than those of doped and pure MgB"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.02234","kind":"arxiv","version":2},"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":"2026-05-18T01:24:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KfsFrvEYq5DLcfYOK+guSphkkw0FGod20YVPXFx3XYdSkVH37i4HX38Hgcj1Z4+Vxz3SnNv7cWUMa+urmdN9BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T03:26:36.684789Z"},"content_sha256":"34da40b6b1726f4b7dfb27315f970ebb00e7a325b006f2cf4b0bad37de272bb7","schema_version":"1.0","event_id":"sha256:34da40b6b1726f4b7dfb27315f970ebb00e7a325b006f2cf4b0bad37de272bb7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ITXLFJXL5ZJGFMDRCMKKCQS6PO/bundle.json","state_url":"https://pith.science/pith/ITXLFJXL5ZJGFMDRCMKKCQS6PO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ITXLFJXL5ZJGFMDRCMKKCQS6PO/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":"2026-05-26T03:26:36Z","links":{"resolver":"https://pith.science/pith/ITXLFJXL5ZJGFMDRCMKKCQS6PO","bundle":"https://pith.science/pith/ITXLFJXL5ZJGFMDRCMKKCQS6PO/bundle.json","state":"https://pith.science/pith/ITXLFJXL5ZJGFMDRCMKKCQS6PO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ITXLFJXL5ZJGFMDRCMKKCQS6PO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:ITXLFJXL5ZJGFMDRCMKKCQS6PO","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":"9966fdd9576f31cd3f3808fa5a561851c6649976794da725ed212831ca25efc3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2015-10-08T08:41:19Z","title_canon_sha256":"969771c683d82603502fb08429d9b19dd0cb07fd1d0fb95641422eb756138c30"},"schema_version":"1.0","source":{"id":"1510.02234","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.02234","created_at":"2026-05-18T01:24:38Z"},{"alias_kind":"arxiv_version","alias_value":"1510.02234v2","created_at":"2026-05-18T01:24:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.02234","created_at":"2026-05-18T01:24:38Z"},{"alias_kind":"pith_short_12","alias_value":"ITXLFJXL5ZJG","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_16","alias_value":"ITXLFJXL5ZJGFMDR","created_at":"2026-05-18T12:29:25Z"},{"alias_kind":"pith_short_8","alias_value":"ITXLFJXL","created_at":"2026-05-18T12:29:25Z"}],"graph_snapshots":[{"event_id":"sha256:34da40b6b1726f4b7dfb27315f970ebb00e7a325b006f2cf4b0bad37de272bb7","target":"graph","created_at":"2026-05-18T01:24:38Z","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":"The MgB2 superconductor was doped with electroluminescent Y2O3:Eu, to synthesise a superconducting metamaterial. The temperature dependence of the resistivity of the superconductor indicates that the critical temperature (TC) of samples decrease when increasing the amount of doped Y2O3 nanorods, due to impurity (Y2O3, MgO and YB4). However, the TC of the samples increase with increasing amount of doped Y2O3:Eu3+ nanorods, which are opposite to doped Y2O3 nanorods. Moreover, the transition temperature of the sample doped with 8 wt. % Y2O3:Eu3+ nanorods is higher than those of doped and pure MgB","authors_text":"Guowei Chen, Shuo Tao, Xiaopeng Zhao, Zhiwei Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2015-10-08T08:41:19Z","title":"Improving the critical temperature of MgB2 superconducting metamaterials induced by electroluminescence"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.02234","kind":"arxiv","version":2},"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":"sha256:5801d020ef871c302adacf1d2825fcfb4b73c397af2fb8c819abe4a5e843d007","target":"record","created_at":"2026-05-18T01:24:38Z","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":"9966fdd9576f31cd3f3808fa5a561851c6649976794da725ed212831ca25efc3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2015-10-08T08:41:19Z","title_canon_sha256":"969771c683d82603502fb08429d9b19dd0cb07fd1d0fb95641422eb756138c30"},"schema_version":"1.0","source":{"id":"1510.02234","kind":"arxiv","version":2}},"canonical_sha256":"44eeb2a6ebee5262b0711314a1425e7bbe0b1e977b3bb2d35fb02e725beccf34","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"44eeb2a6ebee5262b0711314a1425e7bbe0b1e977b3bb2d35fb02e725beccf34","first_computed_at":"2026-05-18T01:24:38.106218Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:24:38.106218Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"enPyqXg02qN5GGtQ+v02mXLGG8s99tTafV1ipuUsNExbchWLOpDq+uq3Lw0Uyd6ae/KVSAu4zDU+67GhZb6FBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:24:38.106712Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.02234","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5801d020ef871c302adacf1d2825fcfb4b73c397af2fb8c819abe4a5e843d007","sha256:34da40b6b1726f4b7dfb27315f970ebb00e7a325b006f2cf4b0bad37de272bb7"],"state_sha256":"caef32ba7a7a54b9ee98c184eb9f903c5f02bfe245c14bb82595cf226d484f2e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4gH9+wTHcUwAz+SwgNM9b7NqBdc5jUA5g+cF+9yLVItx76NQa9cdzf4buO6tcS6vVzih2GC7ODxDWVCzGd2iDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T03:26:36.687861Z","bundle_sha256":"dd75b937f9bb99b5473f5bfbdc0cbffff54eca79555735571d58c6f0e60148cd"}}