Carrier-density dependence of magnetotransport in correlated Dirac semimetal CaIrO$_3$
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866909041485152256 |
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| author | Yamada, Rinsuke Fujioka, Jun Kawamura, Minoru Okawa, Tatsuya Kaneko, Yoshio Sakai, Shiro Hirayama, Motoaki Arita, Ryotaro Adachi, Kiyohiro Hashizume, Daisuke Tokura, Yoshinori |
| author_facet | Yamada, Rinsuke Fujioka, Jun Kawamura, Minoru Okawa, Tatsuya Kaneko, Yoshio Sakai, Shiro Hirayama, Motoaki Arita, Ryotaro Adachi, Kiyohiro Hashizume, Daisuke Tokura, Yoshinori |
| contents | 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 density, supporting a $k$-linear dispersion of the Dirac node. The field dependence of magnetoresistivity is nearly $B$-linear in the moderate carrier density region ($n_\mathrm{H} \geq 4 \times 10^{16}\,$cm$^{-3}$), but scales with $B^α$ ($α> 2$) in the lower carrier density region. The variation of magnetoresistivity is likely affected by the enhanced long-range Coulomb interaction in the quantum limit, where Dirac electrons are subject to the magnetic confinement. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_14180 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Carrier-density dependence of magnetotransport in correlated Dirac semimetal CaIrO$_3$ Yamada, Rinsuke Fujioka, Jun Kawamura, Minoru Okawa, Tatsuya Kaneko, Yoshio Sakai, Shiro Hirayama, Motoaki Arita, Ryotaro Adachi, Kiyohiro Hashizume, Daisuke Tokura, Yoshinori Materials Science Strongly Correlated Electrons 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 density, supporting a $k$-linear dispersion of the Dirac node. The field dependence of magnetoresistivity is nearly $B$-linear in the moderate carrier density region ($n_\mathrm{H} \geq 4 \times 10^{16}\,$cm$^{-3}$), but scales with $B^α$ ($α> 2$) in the lower carrier density region. The variation of magnetoresistivity is likely affected by the enhanced long-range Coulomb interaction in the quantum limit, where Dirac electrons are subject to the magnetic confinement. |
| title | Carrier-density dependence of magnetotransport in correlated Dirac semimetal CaIrO$_3$ |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.14180 |