{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2016:MMNEQVC4RH6CJ3EHOZNRO7HPH4","short_pith_number":"pith:MMNEQVC4","schema_version":"1.0","canonical_sha256":"631a48545c89fc24ec87765b177cef3f28eb2e649c9052c7ff6032164530624c","source":{"kind":"arxiv","id":"1604.04964","version":1},"attestation_state":"computed","paper":{"title":"Superconductivity in undoped CaFe2As2 single crystals","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.supr-con","authors_text":"Bin-Bin Ruan, Bo-Jin Pan, Dong-Yun Chen, Gen-Fu Chen, Jia Yu, Lei Zhang, Qi Guo, Qing-Ge Mu, Xiao-Chuan Wang, Zhi-An Ren","submitted_at":"2016-04-18T02:34:00Z","abstract_excerpt":"Single crystals of undoped CaFe2As2 were grown by a FeAs self-flux method, and the crystals were quenched in ice-water rapidly after high temperature growth. The quenched crystal undergoes a collapsed tetragonal structural phase transition around 80 K revealed by the temperature dependent X-ray diffraction measurements. Superconductivity below 25 K was observed in the collapsed phase by resistivity and magnetization measurements. The isothermal magnetization curve measured at 2 K indicates that this is a typical type-II superconductor. For comparison, we systematically characterized the proper"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1604.04964","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2016-04-18T02:34:00Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"1be54ad8b8180eb06b8cd8219bfdb0e48310f96b750641afb10622804e72b6ed","abstract_canon_sha256":"fbfee8887b0deb2f94d535ce171f7fbf2237f645b852386c06e9015d3afe847c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:37:48.601505Z","signature_b64":"9Q2OexUyoc21tolzCkASWJCEhzBCVpB2RdF/rp0HXT7bOUv0XbzACjyYe0CRS9ZlbCKCDM8TkoRu5/sLiEwFDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"631a48545c89fc24ec87765b177cef3f28eb2e649c9052c7ff6032164530624c","last_reissued_at":"2026-05-18T00:37:48.601016Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:37:48.601016Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Superconductivity in undoped CaFe2As2 single crystals","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.supr-con","authors_text":"Bin-Bin Ruan, Bo-Jin Pan, Dong-Yun Chen, Gen-Fu Chen, Jia Yu, Lei Zhang, Qi Guo, Qing-Ge Mu, Xiao-Chuan Wang, Zhi-An Ren","submitted_at":"2016-04-18T02:34:00Z","abstract_excerpt":"Single crystals of undoped CaFe2As2 were grown by a FeAs self-flux method, and the crystals were quenched in ice-water rapidly after high temperature growth. The quenched crystal undergoes a collapsed tetragonal structural phase transition around 80 K revealed by the temperature dependent X-ray diffraction measurements. Superconductivity below 25 K was observed in the collapsed phase by resistivity and magnetization measurements. The isothermal magnetization curve measured at 2 K indicates that this is a typical type-II superconductor. For comparison, we systematically characterized the proper"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.04964","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1604.04964","created_at":"2026-05-18T00:37:48.601087+00:00"},{"alias_kind":"arxiv_version","alias_value":"1604.04964v1","created_at":"2026-05-18T00:37:48.601087+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.04964","created_at":"2026-05-18T00:37:48.601087+00:00"},{"alias_kind":"pith_short_12","alias_value":"MMNEQVC4RH6C","created_at":"2026-05-18T12:30:32.724797+00:00"},{"alias_kind":"pith_short_16","alias_value":"MMNEQVC4RH6CJ3EH","created_at":"2026-05-18T12:30:32.724797+00:00"},{"alias_kind":"pith_short_8","alias_value":"MMNEQVC4","created_at":"2026-05-18T12:30:32.724797+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/MMNEQVC4RH6CJ3EHOZNRO7HPH4","json":"https://pith.science/pith/MMNEQVC4RH6CJ3EHOZNRO7HPH4.json","graph_json":"https://pith.science/api/pith-number/MMNEQVC4RH6CJ3EHOZNRO7HPH4/graph.json","events_json":"https://pith.science/api/pith-number/MMNEQVC4RH6CJ3EHOZNRO7HPH4/events.json","paper":"https://pith.science/paper/MMNEQVC4"},"agent_actions":{"view_html":"https://pith.science/pith/MMNEQVC4RH6CJ3EHOZNRO7HPH4","download_json":"https://pith.science/pith/MMNEQVC4RH6CJ3EHOZNRO7HPH4.json","view_paper":"https://pith.science/paper/MMNEQVC4","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1604.04964&json=true","fetch_graph":"https://pith.science/api/pith-number/MMNEQVC4RH6CJ3EHOZNRO7HPH4/graph.json","fetch_events":"https://pith.science/api/pith-number/MMNEQVC4RH6CJ3EHOZNRO7HPH4/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/MMNEQVC4RH6CJ3EHOZNRO7HPH4/action/timestamp_anchor","attest_storage":"https://pith.science/pith/MMNEQVC4RH6CJ3EHOZNRO7HPH4/action/storage_attestation","attest_author":"https://pith.science/pith/MMNEQVC4RH6CJ3EHOZNRO7HPH4/action/author_attestation","sign_citation":"https://pith.science/pith/MMNEQVC4RH6CJ3EHOZNRO7HPH4/action/citation_signature","submit_replication":"https://pith.science/pith/MMNEQVC4RH6CJ3EHOZNRO7HPH4/action/replication_record"}},"created_at":"2026-05-18T00:37:48.601087+00:00","updated_at":"2026-05-18T00:37:48.601087+00:00"}