{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2ecb9d5eb0dd4d7d04b4a56fd4e35b5343388e7dcb27d4a9db2c2a66c6b59dd0","created":"2026-10-03T07:17:58Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"77cb6a8c7bcd0179693aa75cb8014ede84ed3447855a1a687aa064655a2a742e","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.altermagnets.ruo2-magnetic-state","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"RuO2 was the first proposed metallic altermagnet, but muon and neutron measurements find no magnetic order in bulk crystals. Signals reported in thin films might come from surfaces or defects.","posed_since":"","precise":"Determine whether stoichiometric rutile RuO2 has collinear antiferromagnetic order with Ru moment above $1e-3\\,\\mu_B$, in bulk and in epitaxial films; if not, identify the origin of the anomalous Hall, spin-splitting torque and spin-resolved ARPES signals reported in films. An answer is a moment value or upper bound per sample type and a mechanism for the film signals.","problem_ref":null,"references":"","settled_by":"Muon, neutron and resonant x-ray measurements on the same films used for transport, combined with depth-resolved magnetic probes.","status_note":"Muon spin rotation and neutron diffraction (2024, arXiv:2405.10820) bound the bulk moment near $1e-4\\,\\mu_{\\mathrm{B}}$ per Ru; a 2026 preprint (arXiv:2604.10659) attributes film signals to surface ferrimagnetism.","title":"Is RuO2 an altermagnet?","topic_ref":"d1dd3aa250598657e4ca48074d196bb1f90d067794af9030bd5e3fb91972b41a"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"c6b4d2931e6c107dea5a127316de0338f5285234e58f980d6ed89323002c63e6","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"de5d3bcb38d1548a49119c5463092abbeb84c36a7783f5af893095562fa24ce8","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"QA025LgAemC4Dz0gaRyzw5w3qnNHl4vmDBV2OLPgHpxg_x0opXP2yxQJH7QyGJHuRr9cFuj5FRtEnYFrEoxBBQ"},"schema":"pubphys.envelope/1"},"record_hash":"c6b4d2931e6c107dea5a127316de0338f5285234e58f980d6ed89323002c63e6","leaf_index":903}