{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:WQZ5VDDWVYGD5E36KIBYVPD5XB","short_pith_number":"pith:WQZ5VDDW","schema_version":"1.0","canonical_sha256":"b433da8c76ae0c3e937e52038abc7db84c94fde4ebee9ce280e75f59407eaafb","source":{"kind":"arxiv","id":"2607.20036","version":1},"attestation_state":"computed","paper":{"title":"Vanishing spin stiffness in weakly disordered two-dimensional Heisenberg ferromagnets","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.dis-nn","authors_text":"Aldo Coraggio, Antonello Scardicchio, Giacomo Bracci-Testasecca, Jacopo Niedda","submitted_at":"2026-07-22T11:23:34Z","abstract_excerpt":"We show that a small fraction of antiferromagnetic bonds qualitatively alters the long-wavelength dynamics of two-dimensional Heisenberg ferromagnets. Although the classical ground state remains magnetized, weak bond frustration generates logarithmically correlated spatial fluctuations of the local spin stiffness, despite the microscopic disorder being short ranged. A replica field theory calculation shows that the effective disorder strength grows under coarse graining, while the spin stiffness decreases, yielding anomalously soft magnons with a scale-dependent dynamical exponent $z > 2$. Num"},"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":"2607.20036","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.dis-nn","submitted_at":"2026-07-22T11:23:34Z","cross_cats_sorted":[],"title_canon_sha256":"1dbb22d3d959e7054256b4331e08bdd411973323a4873eddd2d43bd3fc8224f7","abstract_canon_sha256":"0b9254a2a4adf52b2d3ed50096a61204dffa15b5e99882135717a8b2cd434023"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-23T01:24:56.680822Z","signature_b64":"j/zfqzEjTB4+cRe2u5d6L2vLmQNB571AxvzN0abMeIM5Z2lU3WkYePj+bRBeVi1vg/19QEVgD78TKXO8U92qCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b433da8c76ae0c3e937e52038abc7db84c94fde4ebee9ce280e75f59407eaafb","last_reissued_at":"2026-07-23T01:24:56.679948Z","signature_status":"signed_v1","first_computed_at":"2026-07-23T01:24:56.679948Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Vanishing spin stiffness in weakly disordered two-dimensional Heisenberg ferromagnets","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.dis-nn","authors_text":"Aldo Coraggio, Antonello Scardicchio, Giacomo Bracci-Testasecca, Jacopo Niedda","submitted_at":"2026-07-22T11:23:34Z","abstract_excerpt":"We show that a small fraction of antiferromagnetic bonds qualitatively alters the long-wavelength dynamics of two-dimensional Heisenberg ferromagnets. Although the classical ground state remains magnetized, weak bond frustration generates logarithmically correlated spatial fluctuations of the local spin stiffness, despite the microscopic disorder being short ranged. A replica field theory calculation shows that the effective disorder strength grows under coarse graining, while the spin stiffness decreases, yielding anomalously soft magnons with a scale-dependent dynamical exponent $z > 2$. Num"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.20036","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2607.20036/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2607.20036","created_at":"2026-07-23T01:24:56.680390+00:00"},{"alias_kind":"arxiv_version","alias_value":"2607.20036v1","created_at":"2026-07-23T01:24:56.680390+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.20036","created_at":"2026-07-23T01:24:56.680390+00:00"},{"alias_kind":"pith_short_12","alias_value":"WQZ5VDDWVYGD","created_at":"2026-07-23T01:24:56.680390+00:00"},{"alias_kind":"pith_short_16","alias_value":"WQZ5VDDWVYGD5E36","created_at":"2026-07-23T01:24:56.680390+00:00"},{"alias_kind":"pith_short_8","alias_value":"WQZ5VDDW","created_at":"2026-07-23T01:24:56.680390+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/WQZ5VDDWVYGD5E36KIBYVPD5XB","json":"https://pith.science/pith/WQZ5VDDWVYGD5E36KIBYVPD5XB.json","graph_json":"https://pith.science/api/pith-number/WQZ5VDDWVYGD5E36KIBYVPD5XB/graph.json","events_json":"https://pith.science/api/pith-number/WQZ5VDDWVYGD5E36KIBYVPD5XB/events.json","paper":"https://pith.science/paper/WQZ5VDDW"},"agent_actions":{"view_html":"https://pith.science/pith/WQZ5VDDWVYGD5E36KIBYVPD5XB","download_json":"https://pith.science/pith/WQZ5VDDWVYGD5E36KIBYVPD5XB.json","view_paper":"https://pith.science/paper/WQZ5VDDW","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2607.20036&json=true","fetch_graph":"https://pith.science/api/pith-number/WQZ5VDDWVYGD5E36KIBYVPD5XB/graph.json","fetch_events":"https://pith.science/api/pith-number/WQZ5VDDWVYGD5E36KIBYVPD5XB/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/WQZ5VDDWVYGD5E36KIBYVPD5XB/action/timestamp_anchor","attest_storage":"https://pith.science/pith/WQZ5VDDWVYGD5E36KIBYVPD5XB/action/storage_attestation","attest_author":"https://pith.science/pith/WQZ5VDDWVYGD5E36KIBYVPD5XB/action/author_attestation","sign_citation":"https://pith.science/pith/WQZ5VDDWVYGD5E36KIBYVPD5XB/action/citation_signature","submit_replication":"https://pith.science/pith/WQZ5VDDWVYGD5E36KIBYVPD5XB/action/replication_record"}},"created_at":"2026-07-23T01:24:56.680390+00:00","updated_at":"2026-07-23T01:24:56.680390+00:00"}