{"paper":{"title":"Correlation-driven tunability of altermagnetism in RuO$_2$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Dynamical correlations in RuO2 drive it close to the paramagnetic-altermagnetic boundary, rendering its magnetic state tunable by minimal strain and explaining experimental conflicts.","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Beomjoon Goh, Bo Gyu Jang, DongWook Kim, Ina Park, Jisook Hong","submitted_at":"2026-05-13T14:00:23Z","abstract_excerpt":"RuO$_2$ has been regarded as a prototypical candidate for metallic altermagnet, offering a potential platform for high-speed and high-efficiency spintronics. However, the magnetic ground state of RuO$_2$ remains a topic of active debate due to conflicting experimental reports. In this work, we investigate the effect of electron correlations in RuO$_2$ using density functional theory combined with dynamical mean-field theory (DFT+DMFT). In contrast to previous DFT-based studies, DFT+DMFT captures essential dynamical correlation effects, yielding spectral functions and optical conductivities in "},"claims":{"count":3,"items":[{"kind":"strongest_claim","text":"dynamical correlation effects are the key driving force behind the highly tunable magnetic ground state of RuO₂; even a minimal compressive strain of ∼0.5% is sufficient to drive the system into an altermagnetic phase.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The specific values chosen for the local Hubbard interaction and Hund's coupling in the DMFT impurity solver accurately locate RuO2 near the paramagnetic-altermagnetic boundary without post-hoc adjustment that would move the system across the transition.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Dynamical correlations in RuO2 drive it close to the paramagnetic-altermagnetic boundary, rendering its magnetic state tunable by minimal strain and explaining experimental conflicts.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"}],"snapshot_sha256":"d906e1c504a074512f08be502edc468cfccd62db05d9fd960f80ba762240dee9"},"source":{"id":"2605.13559","kind":"arxiv","version":1},"verdict":{"id":"77122294-5d8e-4c30-9cd7-6f5a708b91e0","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-14T18:16:27.806220Z","strongest_claim":"dynamical correlation effects are the key driving force behind the highly tunable magnetic ground state of RuO₂; even a minimal compressive strain of ∼0.5% is sufficient to drive the system into an altermagnetic phase.","one_line_summary":"Dynamical correlations in RuO2 drive it close to the paramagnetic-altermagnetic boundary, rendering its magnetic state tunable by minimal strain and explaining experimental conflicts.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The specific values chosen for the local Hubbard interaction and Hund's coupling in the DMFT impurity solver accurately locate RuO2 near the paramagnetic-altermagnetic boundary without post-hoc adjustment that would move the system across the transition.","pith_extraction_headline":""},"references":{"count":53,"sample":[{"doi":"","year":2022,"title":"L. ˇSmejkal, J. Sinova, and T. Jungwirth, Physical Review X12, 031042 (2022)","work_id":"952e0498-e6eb-48fd-b985-e991b3c221d5","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2022,"title":"L. ˇSmejkal, J. Sinova, and T. Jungwirth, Physical Review X12, 040501 (2022). 7","work_id":"acb5886a-3db0-4b31-9143-9f273f19ceb8","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2026,"title":"T. Jungwirth, J. Sinova, R. M. Fernandes, Q. Liu, H. Watanabe, S. Murakami, S. Nakatsuji, and L.ˇSmejkal, Nature649, 837 (2026)","work_id":"0f4d26dd-c600-4383-b500-902316a63793","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2022,"title":"L. ˇSmejkal, A. B. Hellenes, R. Gonz´ alez-Hern´ andez, J. Sinova, and T. Jungwirth, Physical Review X12, 011028 (2022)","work_id":"f74f9920-2328-4504-8740-f82ea6a88233","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2025,"title":"T. Jungwirth, J. Sinova, P. Wadley, D. Kriegner, H. Reichlova, F. Krizek, H. Ohno, and L. Smejkal, arXiv:2508.09748 (2025)","work_id":"bdbc5ada-0438-4e14-af5f-0cbecf53a47d","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":53,"snapshot_sha256":"19016e4bf201950b6935372c7ef7c7110571ea0efc9bc23dcccc175f682735c6","internal_anchors":2},"formal_canon":{"evidence_count":2,"snapshot_sha256":"4b07bcf3bdc65f3244caefeefa86eb9e92b7ddc50da9077ca2b81e003401707a"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}