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<p>Superconductivity in <i>d</i>-electron compounds with the tetragonal C16 structure often exhibits resistivity saturation due to <i>s</i>–<i>d</i> scattering. RhZr<sub>2</sub> shows the lowest inflection temperature <i>T</i><sub>infl</sub> and highest superconducting transition temperature <i>T</i><sub>c</sub> among <i>Tr</i>Zr<sub>2</sub> compounds (<i>Tr</i>: transition metals). To clarify the role of <i>s</i>–<i>d</i> scattering, we investigated hydrogenated RhZr<sub>2</sub>H<sub>3.10</sub>. Hydrogen absorption expanded the <i>a</i>-axis lattice constant, suppressed the negative curvature in resistivity, and increased <i>T</i><sub>infl</sub>, indicating weakened <i>s</i>–<i>d</i> scattering. The Hall effect measurements revealed an increase in carrier density upon hydrogenation, while the specific heat measurements showed an enhancement of the Debye temperature. Although both results are typically favorable for superconductivity with a conventional electron–phonon interaction mechanism, superconductivity was suppressed by hydrogenation in RhZr<sub>2</sub>H<sub>3.10</sub>. Our measurements also showed that RhZr<sub>2</sub>H<sub>3.10</sub> exhibits a large residual resistivity and significantly reduced carrier mobility. These results imply that it is possible that the suppression of superconductivity in RhZr<sub>2</sub>H<sub><i>x</i></sub> is associated with disorder induced by hydrogenation.</p>

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Superconducting and Physical Properties of Hydrogenated RhZr2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月18日

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  • Hiroto Arima,
  • Katsutoshi Nomoto,
  • Md. Riad Kasem,
  • Tetsuya Shishido,
  • Yoshikazu Mizuguchi

摘要

Superconductivity in d-electron compounds with the tetragonal C16 structure often exhibits resistivity saturation due to s–d scattering. RhZr2 shows the lowest inflection temperature Tinfl and highest superconducting transition temperature Tc among TrZr2 compounds (Tr: transition metals). To clarify the role of s–d scattering, we investigated hydrogenated RhZr2H3.10. Hydrogen absorption expanded the a-axis lattice constant, suppressed the negative curvature in resistivity, and increased Tinfl, indicating weakened s–d scattering. The Hall effect measurements revealed an increase in carrier density upon hydrogenation, while the specific heat measurements showed an enhancement of the Debye temperature. Although both results are typically favorable for superconductivity with a conventional electron–phonon interaction mechanism, superconductivity was suppressed by hydrogenation in RhZr2H3.10. Our measurements also showed that RhZr2H3.10 exhibits a large residual resistivity and significantly reduced carrier mobility. These results imply that it is possible that the suppression of superconductivity in RhZr2Hx is associated with disorder induced by hydrogenation.