{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:HFTQWH5XQ7DENNVHB22YHQWMLD","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":"ef270c34c4ca16f1ebb4b50d4d02507f0ae1d07ff73ab053f1767526fbf92822","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-06-18T12:36:51Z","title_canon_sha256":"52be5b4e0098307eecdfed66e782e81fcae6d1dccd4a128f3e2f4fea9706c02c"},"schema_version":"1.0","source":{"id":"1906.07531","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.07531","created_at":"2026-05-17T23:39:23Z"},{"alias_kind":"arxiv_version","alias_value":"1906.07531v2","created_at":"2026-05-17T23:39:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.07531","created_at":"2026-05-17T23:39:23Z"},{"alias_kind":"pith_short_12","alias_value":"HFTQWH5XQ7DE","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"HFTQWH5XQ7DENNVH","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"HFTQWH5X","created_at":"2026-05-18T12:33:18Z"}],"graph_snapshots":[{"event_id":"sha256:d3c400bbedc5a56c2bef836661de055eff2c778c6ef699ba63c91decd78f8a71","target":"graph","created_at":"2026-05-17T23:39:23Z","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":"Creating magnetic semiconductors that work at warm circumstance is still a great challenge in the physical sciences. Here, we report the discovery of ferromagnetism in the metal-free perylene diimide semiconductor, whose Curie temperature is higher than 400 Kelvin. A solvothermal approach is used to reduce and dissolve the rigid-backbone perylene diimide crystallites, and radical anion aggregates were fabricated by the subsequent self-assembly and oxidation process. Magnetic measurements exhibit the ferromagnetic ordering with the saturated magnetization of 0.48 $\\mu_{\\rm B}$ per molecule and ","authors_text":"Dehua Hu, Duokai Zhao, Huanhuan Zhang, Jiadong Zhou, Jiang Zhang, Manlin Zhao, Nan Zheng, Qinglin Jiang, Wenqiang Zhang, Xiaolong Li, Yao Yao, Yong Wang, Yuguang Ma, Zhongquan Mao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-06-18T12:36:51Z","title":"Discovery of room temperature ferromagnetism in metal-free organic semiconductors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.07531","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":"sha256:41c065fedb37ce72eb31f11d48b3f8560c1c2b39012e326fbb1b4602d8e226d2","target":"record","created_at":"2026-05-17T23:39:23Z","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":"ef270c34c4ca16f1ebb4b50d4d02507f0ae1d07ff73ab053f1767526fbf92822","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-06-18T12:36:51Z","title_canon_sha256":"52be5b4e0098307eecdfed66e782e81fcae6d1dccd4a128f3e2f4fea9706c02c"},"schema_version":"1.0","source":{"id":"1906.07531","kind":"arxiv","version":2}},"canonical_sha256":"39670b1fb787c646b6a70eb583c2cc58eb1254c1f2f3ed148ad2951d5a24b866","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"39670b1fb787c646b6a70eb583c2cc58eb1254c1f2f3ed148ad2951d5a24b866","first_computed_at":"2026-05-17T23:39:23.882198Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:39:23.882198Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"clFJrQloQAYxKirkeE4bzVw1XjCx2EPGK0kABTyCveI6d8/tPeNkjlqCJ5iZCfFV9DNT8LrMazLN1TxLtEuJCA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:39:23.882911Z","signed_message":"canonical_sha256_bytes"},"source_id":"1906.07531","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:41c065fedb37ce72eb31f11d48b3f8560c1c2b39012e326fbb1b4602d8e226d2","sha256:d3c400bbedc5a56c2bef836661de055eff2c778c6ef699ba63c91decd78f8a71"],"state_sha256":"e2dadbf75e633f41d5819fd124a6b9333c8e2bc76aafded8d580daebf6b47ded"}