{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2011:M2RFYIQJEIXXPRHN327KVHRUR4","short_pith_number":"pith:M2RFYIQJ","schema_version":"1.0","canonical_sha256":"66a25c2209222f77c4eddebeaa9e348f275f59153f6b99a480b6b0a8a6edd2af","source":{"kind":"arxiv","id":"1103.3560","version":1},"attestation_state":"computed","paper":{"title":"First-principles Studies for the Hydrogen Doping Effects on Iron-based Superconductors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Hiroki Nakamura, Masahiko Machida (Japan Atomic Energy Agency)","submitted_at":"2011-03-18T06:51:16Z","abstract_excerpt":"We study hydrogen doping effects in an iron-based superconductor LaFeAsO_(1-y) by using the first-principles calculation and explore the reason why the superconducting transition temperature is remarkably enhanced by the hydrogen doping. The present calculations reveal that a hydrogen cation stably locating close to an iron atom attracts a negatively-charged FeAs layer and results in structural distortion favorable for further high temperature transition. In fact, the lattice constant a averaged over the employed supercell shrinks and then the averaged As-Fe-As angle approaches 109.74 degrees "},"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":"1103.3560","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2011-03-18T06:51:16Z","cross_cats_sorted":[],"title_canon_sha256":"a403dc2250c01eb0194b46a6d9d32b5497fc7438dd7728ff7711a0ce3d87cba6","abstract_canon_sha256":"1fb658a44109c1d7be2e2d299487dd1c889ee5c6fc602fc2a37f704bafb4c481"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:02:50.026478Z","signature_b64":"T3iEf4mAMoQ3HQFe8BHPqcjLsWoyH1mfRbDkkeFQkHO7c+95Gl0diUJ+vMxVBmKl/w4v4zm5EQSKiZajYu3LCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"66a25c2209222f77c4eddebeaa9e348f275f59153f6b99a480b6b0a8a6edd2af","last_reissued_at":"2026-05-18T02:02:50.025725Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:02:50.025725Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"First-principles Studies for the Hydrogen Doping Effects on Iron-based Superconductors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"Hiroki Nakamura, Masahiko Machida (Japan Atomic Energy Agency)","submitted_at":"2011-03-18T06:51:16Z","abstract_excerpt":"We study hydrogen doping effects in an iron-based superconductor LaFeAsO_(1-y) by using the first-principles calculation and explore the reason why the superconducting transition temperature is remarkably enhanced by the hydrogen doping. The present calculations reveal that a hydrogen cation stably locating close to an iron atom attracts a negatively-charged FeAs layer and results in structural distortion favorable for further high temperature transition. In fact, the lattice constant a averaged over the employed supercell shrinks and then the averaged As-Fe-As angle approaches 109.74 degrees "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.3560","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":"1103.3560","created_at":"2026-05-18T02:02:50.025854+00:00"},{"alias_kind":"arxiv_version","alias_value":"1103.3560v1","created_at":"2026-05-18T02:02:50.025854+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.3560","created_at":"2026-05-18T02:02:50.025854+00:00"},{"alias_kind":"pith_short_12","alias_value":"M2RFYIQJEIXX","created_at":"2026-05-18T12:26:34.985390+00:00"},{"alias_kind":"pith_short_16","alias_value":"M2RFYIQJEIXXPRHN","created_at":"2026-05-18T12:26:34.985390+00:00"},{"alias_kind":"pith_short_8","alias_value":"M2RFYIQJ","created_at":"2026-05-18T12:26:34.985390+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/M2RFYIQJEIXXPRHN327KVHRUR4","json":"https://pith.science/pith/M2RFYIQJEIXXPRHN327KVHRUR4.json","graph_json":"https://pith.science/api/pith-number/M2RFYIQJEIXXPRHN327KVHRUR4/graph.json","events_json":"https://pith.science/api/pith-number/M2RFYIQJEIXXPRHN327KVHRUR4/events.json","paper":"https://pith.science/paper/M2RFYIQJ"},"agent_actions":{"view_html":"https://pith.science/pith/M2RFYIQJEIXXPRHN327KVHRUR4","download_json":"https://pith.science/pith/M2RFYIQJEIXXPRHN327KVHRUR4.json","view_paper":"https://pith.science/paper/M2RFYIQJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1103.3560&json=true","fetch_graph":"https://pith.science/api/pith-number/M2RFYIQJEIXXPRHN327KVHRUR4/graph.json","fetch_events":"https://pith.science/api/pith-number/M2RFYIQJEIXXPRHN327KVHRUR4/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/M2RFYIQJEIXXPRHN327KVHRUR4/action/timestamp_anchor","attest_storage":"https://pith.science/pith/M2RFYIQJEIXXPRHN327KVHRUR4/action/storage_attestation","attest_author":"https://pith.science/pith/M2RFYIQJEIXXPRHN327KVHRUR4/action/author_attestation","sign_citation":"https://pith.science/pith/M2RFYIQJEIXXPRHN327KVHRUR4/action/citation_signature","submit_replication":"https://pith.science/pith/M2RFYIQJEIXXPRHN327KVHRUR4/action/replication_record"}},"created_at":"2026-05-18T02:02:50.025854+00:00","updated_at":"2026-05-18T02:02:50.025854+00:00"}