{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:SC7GDZDTYMUCCMIU725FJSKFD3","short_pith_number":"pith:SC7GDZDT","schema_version":"1.0","canonical_sha256":"90be61e473c328213114feba54c9451ec5368b08d5ab973fb2d1bd7308d0c174","source":{"kind":"arxiv","id":"1810.03036","version":1},"attestation_state":"computed","paper":{"title":"Ultrafast negative thermal expansion driven by spin-disorder","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"A. von Reppert, D. Schick, F. Zamponi, H. Zabel, J. Pudell, M. Bargheer, M. Herzog, M. R\\\"ossle","submitted_at":"2018-10-06T18:32:08Z","abstract_excerpt":"We measure the transient strain profile in a nanoscale multilayer system composed of Yttrium, Holmium and Niobium after laser excitation using ultrafast X-ray diffraction. The strain propagation through each layer is determined by transient changes of the material-specific Bragg angles. We experimentally derive the exponentially decreasing stress profile driving the strain wave and show that it closely matches the optical penetration depth. Below the Neel temperature of Ho, the optical excitation triggers negative thermal expansion, which is induced by a quasi-instantaneous contractive stress,"},"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":"1810.03036","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-10-06T18:32:08Z","cross_cats_sorted":[],"title_canon_sha256":"e9c960b6572caa4c499323e1c0bd71cbe1eca0c460b73e583279325bb9ab2380","abstract_canon_sha256":"ed666298bed0faf4f3bd81361a37e734a190e9c7a4d28918d347436759c49bde"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:12.151480Z","signature_b64":"WYRQtlekCMgJynf4/LF9qmkn8b8Zz6Idt8qOl4LZipN+wGFeeVvZpOAzn78EYlX6ShW6sgwlPd4LsEkCsSpADg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"90be61e473c328213114feba54c9451ec5368b08d5ab973fb2d1bd7308d0c174","last_reissued_at":"2026-05-17T23:50:12.151024Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:12.151024Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Ultrafast negative thermal expansion driven by spin-disorder","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"A. von Reppert, D. Schick, F. Zamponi, H. Zabel, J. Pudell, M. Bargheer, M. Herzog, M. R\\\"ossle","submitted_at":"2018-10-06T18:32:08Z","abstract_excerpt":"We measure the transient strain profile in a nanoscale multilayer system composed of Yttrium, Holmium and Niobium after laser excitation using ultrafast X-ray diffraction. The strain propagation through each layer is determined by transient changes of the material-specific Bragg angles. We experimentally derive the exponentially decreasing stress profile driving the strain wave and show that it closely matches the optical penetration depth. Below the Neel temperature of Ho, the optical excitation triggers negative thermal expansion, which is induced by a quasi-instantaneous contractive stress,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.03036","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":"1810.03036","created_at":"2026-05-17T23:50:12.151108+00:00"},{"alias_kind":"arxiv_version","alias_value":"1810.03036v1","created_at":"2026-05-17T23:50:12.151108+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.03036","created_at":"2026-05-17T23:50:12.151108+00:00"},{"alias_kind":"pith_short_12","alias_value":"SC7GDZDTYMUC","created_at":"2026-05-18T12:32:50.500415+00:00"},{"alias_kind":"pith_short_16","alias_value":"SC7GDZDTYMUCCMIU","created_at":"2026-05-18T12:32:50.500415+00:00"},{"alias_kind":"pith_short_8","alias_value":"SC7GDZDT","created_at":"2026-05-18T12:32:50.500415+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/SC7GDZDTYMUCCMIU725FJSKFD3","json":"https://pith.science/pith/SC7GDZDTYMUCCMIU725FJSKFD3.json","graph_json":"https://pith.science/api/pith-number/SC7GDZDTYMUCCMIU725FJSKFD3/graph.json","events_json":"https://pith.science/api/pith-number/SC7GDZDTYMUCCMIU725FJSKFD3/events.json","paper":"https://pith.science/paper/SC7GDZDT"},"agent_actions":{"view_html":"https://pith.science/pith/SC7GDZDTYMUCCMIU725FJSKFD3","download_json":"https://pith.science/pith/SC7GDZDTYMUCCMIU725FJSKFD3.json","view_paper":"https://pith.science/paper/SC7GDZDT","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1810.03036&json=true","fetch_graph":"https://pith.science/api/pith-number/SC7GDZDTYMUCCMIU725FJSKFD3/graph.json","fetch_events":"https://pith.science/api/pith-number/SC7GDZDTYMUCCMIU725FJSKFD3/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/SC7GDZDTYMUCCMIU725FJSKFD3/action/timestamp_anchor","attest_storage":"https://pith.science/pith/SC7GDZDTYMUCCMIU725FJSKFD3/action/storage_attestation","attest_author":"https://pith.science/pith/SC7GDZDTYMUCCMIU725FJSKFD3/action/author_attestation","sign_citation":"https://pith.science/pith/SC7GDZDTYMUCCMIU725FJSKFD3/action/citation_signature","submit_replication":"https://pith.science/pith/SC7GDZDTYMUCCMIU725FJSKFD3/action/replication_record"}},"created_at":"2026-05-17T23:50:12.151108+00:00","updated_at":"2026-05-17T23:50:12.151108+00:00"}