{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:M7UO2RK3LFPEAMXZSARN3WW2TN","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":"22a7f0c24ff93c4c648972431ee13e2a6cf7a191b90d0b29d2403594f264d2f7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-11-16T20:16:01Z","title_canon_sha256":"760cba9dbae1b736ebe3dfc722c83cfc862d92b1ab90e568f9efb920e6d5e62b"},"schema_version":"1.0","source":{"id":"0911.3004","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0911.3004","created_at":"2026-05-18T02:10:47Z"},{"alias_kind":"arxiv_version","alias_value":"0911.3004v1","created_at":"2026-05-18T02:10:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.3004","created_at":"2026-05-18T02:10:47Z"},{"alias_kind":"pith_short_12","alias_value":"M7UO2RK3LFPE","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"M7UO2RK3LFPEAMXZ","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"M7UO2RK3","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:9ab2be2d16e75f97d84b07ea1c7720bd5d97e78c9580171ee7d157ba1290bba4","target":"graph","created_at":"2026-05-18T02:10:47Z","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 present results of density-functional calculations on the magnetic properties of Cr, Mn, Fe and Co nano-clusters (1 to 9 atoms large) supported on Cu(001) and Cu(111). The inter-atomic exchange coupling is found to depend on competing mechanisms, namely ferromagnetic double exchange and antiferromagnetic kinetic exchange. Hybridization-induced broadening of the resonances is shown to be important for the coupling strength. The cluster shape is found to weaken the coupling via a mechanism that comprises the different orientation of the atomic d-orbitals and the strength of nearest-neighbour ","authors_text":"Phivos Mavropoulos, Samir Lounis, Stefan Bl\\\"ugel","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-11-16T20:16:01Z","title":"Exchange coupling in transition-metal nano-clusters on Cu(001) and Cu(111) surfaces"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.3004","kind":"arxiv","version":1},"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":"sha256:149812f60510aa8dbc86c7b7ffc912ee559a8f05fc0bbd1d6a368053ddf4617c","target":"record","created_at":"2026-05-18T02:10:47Z","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":"22a7f0c24ff93c4c648972431ee13e2a6cf7a191b90d0b29d2403594f264d2f7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2009-11-16T20:16:01Z","title_canon_sha256":"760cba9dbae1b736ebe3dfc722c83cfc862d92b1ab90e568f9efb920e6d5e62b"},"schema_version":"1.0","source":{"id":"0911.3004","kind":"arxiv","version":1}},"canonical_sha256":"67e8ed455b595e4032f99022dddada9b658aff87d02b229132ab9e0bff772aaf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"67e8ed455b595e4032f99022dddada9b658aff87d02b229132ab9e0bff772aaf","first_computed_at":"2026-05-18T02:10:47.296331Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:10:47.296331Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vTWOoDj4PV66s5b+rMRxUJtJMWo3HwvmcA3rN311W5KK+UriBueErXev5f2MtGq3SOuNnLbiGknn74uK6+9iDA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:10:47.297112Z","signed_message":"canonical_sha256_bytes"},"source_id":"0911.3004","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:149812f60510aa8dbc86c7b7ffc912ee559a8f05fc0bbd1d6a368053ddf4617c","sha256:9ab2be2d16e75f97d84b07ea1c7720bd5d97e78c9580171ee7d157ba1290bba4"],"state_sha256":"eaab688decc6db170aa0549ab242acd9e187a1a9ce3f7f7e927218a0096cdc8d"}