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<p>Recently, superconductivity was discovered with a superconducting transition temperature (<i>T</i><sub><i>c</i></sub>) of 2 K in strained (110)-oriented RuO<sub>2</sub> films grown on TiO<sub>2</sub>(110) single-crystal substrates. In this work, we predict and realize superconductivity in strained (100)-oriented RuO<sub>2</sub> thin films grown on TiO<sub>2</sub>(100) single-crystal substrates. We show that while density functional theory predicts the <i>T</i><sub><i>c</i></sub> of strained RuO<sub>2</sub>(100) films to be even higher than the RuO<sub>2</sub>(110) films, our transport and angle-resolved photoemission spectroscopy measurements find the <i>T</i><sub><i>c</i></sub> to be about 1 K in strained RuO<sub>2</sub>(100) films grown on TiO<sub>2</sub>(100) substrates. Nonetheless, the thickness dependence of the <i>T</i><sub><i>c</i></sub> follows a similar trend in both cases. Our scanning SQUID measurements reveal a local superfluid response, indicating a 100 mK inhomogeneity in <i>T</i><sub><i>c</i></sub> over a 100 <i>μ</i>m scale.</p><p></p>

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Strain-induced superconductivity in RuO2(100) thin-films

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月3日

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  • Neha Wadehra,
  • Benjamin Z. Gregory,
  • Shuyuan Zhang,
  • Noah Schnitzer,
  • Yusuke Iguchi,
  • Yilin Evan Li,
  • Betül Pamuk,
  • David A. Muller,
  • Andrej Singer,
  • Kyle M. Shen,
  • Darrell G. Schlom

摘要

Recently, superconductivity was discovered with a superconducting transition temperature (Tc) of 2 K in strained (110)-oriented RuO2 films grown on TiO2(110) single-crystal substrates. In this work, we predict and realize superconductivity in strained (100)-oriented RuO2 thin films grown on TiO2(100) single-crystal substrates. We show that while density functional theory predicts the Tc of strained RuO2(100) films to be even higher than the RuO2(110) films, our transport and angle-resolved photoemission spectroscopy measurements find the Tc to be about 1 K in strained RuO2(100) films grown on TiO2(100) substrates. Nonetheless, the thickness dependence of the Tc follows a similar trend in both cases. Our scanning SQUID measurements reveal a local superfluid response, indicating a 100 mK inhomogeneity in Tc over a 100 μm scale.