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<p>The interplay between superconductivity and charge or spin order is a key focus in condensed matter physics, with kagome lattice systems providing unique insights. The kagome superconductor LaRu<sub>3</sub>Si<sub>2</sub> (<i>T</i><sub>c</sub> ≃ 6.5 K) features a characteristic kagome band structure and a hierarchy of charge order transitions at <i>T</i><sub>co,I</sub>&#xa0;≃&#xa0;400 K and <i>T</i><sub>co,II</sub>&#xa0;≃&#xa0;80 K, along with an additional transition at <i>T</i>* ≃ 35 K associated with electronic and magnetic responses. Using magnetotransport under pressure up to 40 GPa, we find <i>T</i><sub>c</sub> peaks at 9 K (2 GPa)—the highest among kagome superconductors—remains nearly constant up to 12 GPa, and then decreases to 2 K at 40 GPa, forming a dome-shaped phase diagram. Similarly, both the resistivity anomaly at <i>T</i>* and the magnetoresistance exhibit a dome-shaped pressure dependence. Moreover, above 12 GPa, X-ray diffraction reveals that the charge order evolves from long-range to short-range, coinciding with the suppression of <i>T</i><sub>c</sub>. These observations indicate that superconductivity in LaRu<sub>3</sub>Si<sub>2</sub> is closely linked to the charge-ordered state and the electronic responses at <i>T</i><sub>co,II</sub> and <i>T</i>*.</p>

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Correlation between the dome-shaped superconducting phase diagram, charge order, and normal-state electronic properties in LaRu3Si2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月4日

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  • KeYuan Ma,
  • Igor Plokhikh,
  • Jennifer N. Graham,
  • Charles Mielke III,
  • Vahid Sazgari,
  • Hiroto Nakamura,
  • Shams Sohel Islam,
  • Soohyeon Shin,
  • Petr Král,
  • Orion Gerguri,
  • Hubertus Luetkens,
  • Fabian O. von Rohr,
  • Jiaxin Yin,
  • Ekaterina Pomjakushina,
  • Claudia Felser,
  • Satoru Nakatsuji,
  • Björn Wehinger,
  • Dariusz J. Gawryluk,
  • Sergey Medvedev,
  • Zurab Guguchia

摘要

The interplay between superconductivity and charge or spin order is a key focus in condensed matter physics, with kagome lattice systems providing unique insights. The kagome superconductor LaRu3Si2 (Tc ≃ 6.5 K) features a characteristic kagome band structure and a hierarchy of charge order transitions at Tco,I ≃ 400 K and Tco,II ≃ 80 K, along with an additional transition at T* ≃ 35 K associated with electronic and magnetic responses. Using magnetotransport under pressure up to 40 GPa, we find Tc peaks at 9 K (2 GPa)—the highest among kagome superconductors—remains nearly constant up to 12 GPa, and then decreases to 2 K at 40 GPa, forming a dome-shaped phase diagram. Similarly, both the resistivity anomaly at T* and the magnetoresistance exhibit a dome-shaped pressure dependence. Moreover, above 12 GPa, X-ray diffraction reveals that the charge order evolves from long-range to short-range, coinciding with the suppression of Tc. These observations indicate that superconductivity in LaRu3Si2 is closely linked to the charge-ordered state and the electronic responses at Tco,II and T*.