{"paper":{"title":"Carrier-density dependence of magnetotransport in correlated Dirac semimetal CaIrO$_3$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Fermi velocity in CaIrO3 stays nearly constant as carrier density changes, supporting k-linear Dirac dispersion","cross_cats":["cond-mat.str-el"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Daisuke Hashizume, Jun Fujioka, Kiyohiro Adachi, Minoru Kawamura, Motoaki Hirayama, Rinsuke Yamada, Ryotaro Arita, Shiro Sakai, Tatsuya Okawa, Yoshinori Tokura, Yoshio Kaneko","submitted_at":"2026-05-13T23:02:26Z","abstract_excerpt":"We report the carrier density dependence of the magnetotransport property in the correlated Dirac semimetal CaIrO$_3$. In the dilute carrier density region ($n_{\\rm H}$ $\\sim 2.2 \\times 10^{16} \\,$$\\rm{cm}^{-3}$) at $2 \\, \\mathrm{K}$, the mobility exceeds $1.0 \\times 10^{5} \\,$$\\rm{cm}^{2}/\\rm{Vs}$ at $2 \\, \\mathrm{K}$, and the transverse magnetoresistance (MR) reaches $2,000 \\,$\\% at $12 \\, \\mathrm{T}$. The analysis of quantum oscillations and Hall conductivity shows that the Fermi velocity is nearly independent of the cross-sectional area of the Fermi surface, or equivalently the carrier den"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The analysis of quantum oscillations and Hall conductivity shows that the Fermi velocity is nearly independent of the cross-sectional area of the Fermi surface, or equivalently the carrier density, supporting a k-linear dispersion of the Dirac node.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the quantum oscillations and Hall conductivity arise predominantly from the Dirac nodes rather than from other bands, impurities, or surface states that could produce similar signals.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"In CaIrO3 the Fermi velocity remains nearly constant across carrier densities, confirming k-linear Dirac dispersion, while magnetoresistance field scaling shifts from linear to super-quadratic at low densities due to enhanced Coulomb interactions in the quantum limit.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Fermi velocity in CaIrO3 stays nearly constant as carrier density changes, supporting k-linear Dirac dispersion","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"9022f8d6c21328b79deaff51f9c45cc7ce2d53fbb1457a07649928207859fdc1"},"source":{"id":"2605.14180","kind":"arxiv","version":1},"verdict":{"id":"90fa5b4a-ba5e-419e-9376-4ccaae498279","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T01:38:27.902868Z","strongest_claim":"The analysis of quantum oscillations and Hall conductivity shows that the Fermi velocity is nearly independent of the cross-sectional area of the Fermi surface, or equivalently the carrier density, supporting a k-linear dispersion of the Dirac node.","one_line_summary":"In CaIrO3 the Fermi velocity remains nearly constant across carrier densities, confirming k-linear Dirac dispersion, while magnetoresistance field scaling shifts from linear to super-quadratic at low densities due to enhanced Coulomb interactions in the quantum limit.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the quantum oscillations and Hall conductivity arise predominantly from the Dirac nodes rather than from other bands, impurities, or surface states that could produce similar signals.","pith_extraction_headline":"Fermi velocity in CaIrO3 stays nearly constant as carrier density changes, supporting k-linear Dirac dispersion"},"references":{"count":35,"sample":[{"doi":"","year":2018,"title":"N. P. Armitage, E. J. Mele, and A. Vishwanath, Weyl and Dirac semimetals in three- dimensional solids, Rev. Mod. Phys.90, 015001 (2018)","work_id":"8f2c8559-a2cd-4062-9059-bcaa7d9f5d66","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2005,"title":"Y. Zhang, Y.-W. Tan, H. L. Stormer, and P. Kim, Experimental observation of the quantum Hall effect and Berry’s phase in graphene, Nature438, 201 (2005)","work_id":"ebad0648-a585-41c6-9e08-a477f8c18c28","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2017,"title":"M. Uchida, Y. Nakazawa, S. Nishihaya, K. Akiba, M. Kriener, Y. Kozuka, A. Miyake, Y. Taguchi, M. Tokunaga, N. Nagaosa, Y. Tokura, and M. Kawasaki, Quantum Hall states observed in thin films of Dirac s","work_id":"c18eed3d-25e0-48ba-89a2-27da82a4215a","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2018,"title":"M. Goyal, L. Galletti, S. Salmani-Rezaie, T. Schumann, D. A. Kealhofer, and S. Stemmer, Thickness dependence of the quantum Hall effect in films of the three-dimensional Dirac semimetal Cd3As2, APL Ma","work_id":"80fd7477-9de0-47b9-98b3-585a23c66f78","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1953,"title":"P. B. Alers and R. T. Webber, The Magnetoresistance of Bismuth Crystals at Low Tempera- tures, Phys. Rev.91, 1060 (1953)","work_id":"95c40e44-dbe2-4cce-9bd0-8ff457eb43e6","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":35,"snapshot_sha256":"f3f65d9e8bf92f29c6901b04444a5f163fbae70eeb145248cb3a879909d26e3b","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"}