Fermi-liquid behavior and characteristic temperature-dependent susceptibility in clean RuO$_2$ crystal
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915966600871936 |
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| author | Paul, Shubhankar Ikeda, Atsutoshi Matsuki, Hisakazu Mattoni, Giordano Schmalian, Jörg Yamauchi, Kunihiko Sow, Chanchal Yonezawa, Shingo Maeno, Yoshiteru |
| author_facet | Paul, Shubhankar Ikeda, Atsutoshi Matsuki, Hisakazu Mattoni, Giordano Schmalian, Jörg Yamauchi, Kunihiko Sow, Chanchal Yonezawa, Shingo Maeno, Yoshiteru |
| contents | The magnetic nature of the altermagnet candidate RuO$_2$ remains under debate. It has been recently shown from quantum oscillations and angle-resolved photoemission spectroscopy (ARPES) that the high-quality RuO$_2$ bulk single crystal is a paramagnetic metal. Here we report the specific heat and magnetic susceptibility in ultra-clean RuO$_2$ single crystals with residual resistivity ratio up to 1200. The magnetic susceptibility increases with temperature and is phenomenologically fitted with an inclusion of $T\textrm{ln}(T/T_0)$ over a wide temperature range up to 400 K. In contrast, the energy dependence of the density of states and thermal activation of quasiparticles lead to a decrease with temperature. Such characteristic temperature dependence, similar to that observed in other $d$-electron metals, is attributable to an enhanced orbital contribution arising from lattice-expansion-induced changes in the band structure. The electronic specific heat, the magnetic susceptibility, and the $T^2$ coefficient in resistivity point to a weakly-correlated 3D Fermi-liquid state with a modest electron correlation, as supported by the Wilson and Kadowaki-Woods ratios. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_03108 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fermi-liquid behavior and characteristic temperature-dependent susceptibility in clean RuO$_2$ crystal Paul, Shubhankar Ikeda, Atsutoshi Matsuki, Hisakazu Mattoni, Giordano Schmalian, Jörg Yamauchi, Kunihiko Sow, Chanchal Yonezawa, Shingo Maeno, Yoshiteru Materials Science The magnetic nature of the altermagnet candidate RuO$_2$ remains under debate. It has been recently shown from quantum oscillations and angle-resolved photoemission spectroscopy (ARPES) that the high-quality RuO$_2$ bulk single crystal is a paramagnetic metal. Here we report the specific heat and magnetic susceptibility in ultra-clean RuO$_2$ single crystals with residual resistivity ratio up to 1200. The magnetic susceptibility increases with temperature and is phenomenologically fitted with an inclusion of $T\textrm{ln}(T/T_0)$ over a wide temperature range up to 400 K. In contrast, the energy dependence of the density of states and thermal activation of quasiparticles lead to a decrease with temperature. Such characteristic temperature dependence, similar to that observed in other $d$-electron metals, is attributable to an enhanced orbital contribution arising from lattice-expansion-induced changes in the band structure. The electronic specific heat, the magnetic susceptibility, and the $T^2$ coefficient in resistivity point to a weakly-correlated 3D Fermi-liquid state with a modest electron correlation, as supported by the Wilson and Kadowaki-Woods ratios. |
| title | Fermi-liquid behavior and characteristic temperature-dependent susceptibility in clean RuO$_2$ crystal |
| topic | Materials Science |
| url | https://arxiv.org/abs/2512.03108 |