{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:O2B2G5J4GEYMRAPGZTK2XK47QH","short_pith_number":"pith:O2B2G5J4","canonical_record":{"source":{"id":"1510.07762","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-10-27T03:34:20Z","cross_cats_sorted":[],"title_canon_sha256":"640314bc750d6f7e6c46c6f1c8ee6da525146422caa3ff8a4d472ec1840f73b1","abstract_canon_sha256":"1786757cccb8fa33fd51073d4806f066a74ec4180bef8ee482d3d78ff1652eee"},"schema_version":"1.0"},"canonical_sha256":"7683a3753c3130c881e6ccd5abab9f81d032c54df6ba4f253f2d716e7bd6e2d4","source":{"kind":"arxiv","id":"1510.07762","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.07762","created_at":"2026-05-18T01:17:25Z"},{"alias_kind":"arxiv_version","alias_value":"1510.07762v2","created_at":"2026-05-18T01:17:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.07762","created_at":"2026-05-18T01:17:25Z"},{"alias_kind":"pith_short_12","alias_value":"O2B2G5J4GEYM","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"O2B2G5J4GEYMRAPG","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"O2B2G5J4","created_at":"2026-05-18T12:29:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:O2B2G5J4GEYMRAPGZTK2XK47QH","target":"record","payload":{"canonical_record":{"source":{"id":"1510.07762","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-10-27T03:34:20Z","cross_cats_sorted":[],"title_canon_sha256":"640314bc750d6f7e6c46c6f1c8ee6da525146422caa3ff8a4d472ec1840f73b1","abstract_canon_sha256":"1786757cccb8fa33fd51073d4806f066a74ec4180bef8ee482d3d78ff1652eee"},"schema_version":"1.0"},"canonical_sha256":"7683a3753c3130c881e6ccd5abab9f81d032c54df6ba4f253f2d716e7bd6e2d4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:17:25.196190Z","signature_b64":"I5uD087+i0yAdKIu4AFrkzFQkj5PGFUTVVOjPCakNxpOEcUrsEMWUgIQIeGz7AFJM4t2m3hthjUCbk2P9VjUCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7683a3753c3130c881e6ccd5abab9f81d032c54df6ba4f253f2d716e7bd6e2d4","last_reissued_at":"2026-05-18T01:17:25.195646Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:17:25.195646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.07762","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":"2026-05-18T01:17:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"A9GFtsgQ4cTMd6/FH3Md2E0JOQ0KNlS6FxQjK/eSfOExuzoa5ZL1hWznEUxYz8/RvtDlLUwD0uza2FOlzuM5CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T06:18:27.749176Z"},"content_sha256":"f90584199859797d6df0fee88479129c034ad29f0b70979877df6aebf0d31613","schema_version":"1.0","event_id":"sha256:f90584199859797d6df0fee88479129c034ad29f0b70979877df6aebf0d31613"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:O2B2G5J4GEYMRAPGZTK2XK47QH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quasi-one-dimensional quantum spin liquid in the $\\rm {Cu(C_4H_4N_2)(NO_3)_2}$ insulator","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"E.V. Kirichenko, K.G. Popov, V.A. Stephanovich, V.R. Shaginyan","submitted_at":"2015-10-27T03:34:20Z","abstract_excerpt":"We analyze measurements of the magnetization, differential susceptibility and specific heat of quasi-one dimensional insulator Cu(C$_4$H$_4$N$_2$)(NO$_3$)$_2$ (CuPzN) subjected to magnetic fields. We show that the thermodynamic properties are defined by quantum spin liquid formed with spinons, with the magnetic field tuning the insulator CuPzN towards quantum critical point related to fermion condensation quantum phase transition (FCQPT) at which the spinon effective mass diverges kinematically. We show that the FCQPT concept permits to reveal and explain the scaling behavior of thermodynamic "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.07762","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":"2026-05-18T01:17:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MaCgQPrhkwwn9WgwbrLA8MrwyHi5moaR6ztQ/m65iUTSh6b6QE2uhVlmLo5T2QgGSMKN7P39NGw2g9dFMsQuBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T06:18:27.749552Z"},"content_sha256":"dc846cfe3845d803048d857d85133a05499042af9107b5c3fa6c38e2330ae18d","schema_version":"1.0","event_id":"sha256:dc846cfe3845d803048d857d85133a05499042af9107b5c3fa6c38e2330ae18d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/O2B2G5J4GEYMRAPGZTK2XK47QH/bundle.json","state_url":"https://pith.science/pith/O2B2G5J4GEYMRAPGZTK2XK47QH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/O2B2G5J4GEYMRAPGZTK2XK47QH/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":"2026-06-02T06:18:27Z","links":{"resolver":"https://pith.science/pith/O2B2G5J4GEYMRAPGZTK2XK47QH","bundle":"https://pith.science/pith/O2B2G5J4GEYMRAPGZTK2XK47QH/bundle.json","state":"https://pith.science/pith/O2B2G5J4GEYMRAPGZTK2XK47QH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/O2B2G5J4GEYMRAPGZTK2XK47QH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:O2B2G5J4GEYMRAPGZTK2XK47QH","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":"1786757cccb8fa33fd51073d4806f066a74ec4180bef8ee482d3d78ff1652eee","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-10-27T03:34:20Z","title_canon_sha256":"640314bc750d6f7e6c46c6f1c8ee6da525146422caa3ff8a4d472ec1840f73b1"},"schema_version":"1.0","source":{"id":"1510.07762","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.07762","created_at":"2026-05-18T01:17:25Z"},{"alias_kind":"arxiv_version","alias_value":"1510.07762v2","created_at":"2026-05-18T01:17:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.07762","created_at":"2026-05-18T01:17:25Z"},{"alias_kind":"pith_short_12","alias_value":"O2B2G5J4GEYM","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"O2B2G5J4GEYMRAPG","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"O2B2G5J4","created_at":"2026-05-18T12:29:34Z"}],"graph_snapshots":[{"event_id":"sha256:dc846cfe3845d803048d857d85133a05499042af9107b5c3fa6c38e2330ae18d","target":"graph","created_at":"2026-05-18T01:17:25Z","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":"We analyze measurements of the magnetization, differential susceptibility and specific heat of quasi-one dimensional insulator Cu(C$_4$H$_4$N$_2$)(NO$_3$)$_2$ (CuPzN) subjected to magnetic fields. We show that the thermodynamic properties are defined by quantum spin liquid formed with spinons, with the magnetic field tuning the insulator CuPzN towards quantum critical point related to fermion condensation quantum phase transition (FCQPT) at which the spinon effective mass diverges kinematically. We show that the FCQPT concept permits to reveal and explain the scaling behavior of thermodynamic ","authors_text":"E.V. Kirichenko, K.G. Popov, V.A. Stephanovich, V.R. Shaginyan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-10-27T03:34:20Z","title":"Quasi-one-dimensional quantum spin liquid in the $\\rm {Cu(C_4H_4N_2)(NO_3)_2}$ insulator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.07762","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:f90584199859797d6df0fee88479129c034ad29f0b70979877df6aebf0d31613","target":"record","created_at":"2026-05-18T01:17:25Z","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":"1786757cccb8fa33fd51073d4806f066a74ec4180bef8ee482d3d78ff1652eee","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-10-27T03:34:20Z","title_canon_sha256":"640314bc750d6f7e6c46c6f1c8ee6da525146422caa3ff8a4d472ec1840f73b1"},"schema_version":"1.0","source":{"id":"1510.07762","kind":"arxiv","version":2}},"canonical_sha256":"7683a3753c3130c881e6ccd5abab9f81d032c54df6ba4f253f2d716e7bd6e2d4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7683a3753c3130c881e6ccd5abab9f81d032c54df6ba4f253f2d716e7bd6e2d4","first_computed_at":"2026-05-18T01:17:25.195646Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:17:25.195646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"I5uD087+i0yAdKIu4AFrkzFQkj5PGFUTVVOjPCakNxpOEcUrsEMWUgIQIeGz7AFJM4t2m3hthjUCbk2P9VjUCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:17:25.196190Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.07762","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f90584199859797d6df0fee88479129c034ad29f0b70979877df6aebf0d31613","sha256:dc846cfe3845d803048d857d85133a05499042af9107b5c3fa6c38e2330ae18d"],"state_sha256":"3f87e533bb48091f5c9f5bc7088b70eb834f17898dd5aca85538f74367a648db"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IZJ1OuRkvkhUU1aFjWNr8gQgfyMTVipK5sBS5gdnGkKpWuc5Dtmw/YOmEZriTAvTWGtLxZmWnerJzneEP0SSAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T06:18:27.751917Z","bundle_sha256":"b27d86de64265ed87399ca47ceccde38e6c347e2e632901b7c9b4ce2db87b93d"}}