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<p>Unconventional superconductivity typically emerges out of a strongly correlated normal state, manifesting as a highly renormalised Fermi liquid or a strange metal with <i>T</i>-linear resistivity. In Ruddlesden-Popper bilayer nickelates, superconductivity with a critical temperature <i>T</i><sub>c</sub> exceeding 80 and 40 K has been respectively realised in pressurised bulk crystals and epitaxially strained thin films. These advancements call for the characterisation of fundamental normal-state and superconducting parameters in these new materials platforms of high-<i>T</i><sub>c</sub> superconductivity. Here we report detailed magnetotransport experiments on superconducting La<sub>2</sub>PrNi<sub>2</sub>O<sub>7</sub> (LPNO) thin films under pulsed magnetic fields up to 64 T and access the normal-state behaviour over a wide temperature range between 1.5 and 300 K. We find that the normal state of thin-film LPNO exhibits the hallmarks of Fermi-liquid transport, including <i>T</i><sup>2</sup> temperature dependence of resistivity and Hall angle, and <i>H</i><sup>2</sup> magnetoresistance obeying Kohler scaling. Using the empirical Kadowaki-Woods ratio, we estimate a quasiparticle effective mass <i>m</i><sup>*</sup>/<i>m</i><sub><i>e</i></sub>&#xa0;≃&#xa0;10, thereby revealing the highly renormalised Fermi liquid state therein. Our results demonstrate that thin-film LPNO follows the same <i>T</i><sub>c</sub>/<i>T</i><sub>F</sub> scaling observed across a myriad of strongly correlated superconductors and establish key normal-state characteristics of strained bilayer superconducting nickelates.</p>

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Fermi-liquid transport beyond the upper critical field in superconducting La2PrNi2O7 thin films

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月10日

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  • Yu-Te Hsu,
  • Yidi Liu,
  • Yoshimitsu Kohama,
  • Tommy Kotte,
  • Vikash Sharma,
  • Yaoju Tarn,
  • Bai Yang Wang,
  • Zhi-Xun Shen,
  • Yijun Yu,
  • Harold Y. Hwang

摘要

Unconventional superconductivity typically emerges out of a strongly correlated normal state, manifesting as a highly renormalised Fermi liquid or a strange metal with T-linear resistivity. In Ruddlesden-Popper bilayer nickelates, superconductivity with a critical temperature Tc exceeding 80 and 40 K has been respectively realised in pressurised bulk crystals and epitaxially strained thin films. These advancements call for the characterisation of fundamental normal-state and superconducting parameters in these new materials platforms of high-Tc superconductivity. Here we report detailed magnetotransport experiments on superconducting La2PrNi2O7 (LPNO) thin films under pulsed magnetic fields up to 64 T and access the normal-state behaviour over a wide temperature range between 1.5 and 300 K. We find that the normal state of thin-film LPNO exhibits the hallmarks of Fermi-liquid transport, including T2 temperature dependence of resistivity and Hall angle, and H2 magnetoresistance obeying Kohler scaling. Using the empirical Kadowaki-Woods ratio, we estimate a quasiparticle effective mass m*/me ≃ 10, thereby revealing the highly renormalised Fermi liquid state therein. Our results demonstrate that thin-film LPNO follows the same Tc/TF scaling observed across a myriad of strongly correlated superconductors and establish key normal-state characteristics of strained bilayer superconducting nickelates.