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<p>Superconductivity and nontrivial topology are highly sought-after phenomena in quantum materials. While many topological crystalline materials have been found to exhibit superconductivity, their presence in quasicrystals—materials with a unique aperiodic yet ordered structure—has remained largely unexplored. In this work, we report the discovery of superconductivity in a monoclinic approximant to the decagonal quasicrystal Al<sub>13</sub>Os<sub>4</sub>, that exhibits a high superconducting transition temperature and a nontrivial electronic structure. The resistivity, magnetization, specific heat, and <i>μ</i>SR measurements confirm superconductivity with a critical temperature of ~5.47 K. Detailed electronic structure and symmetry analysis reveal nontrivial state with <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="43246_2025_949_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="50" /> </InlineMediaObject> <EquationSource Format="TEX">\({{{{\mathcal{Z}}}}}_{2}=1\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mrow> <mi class="MJX-tex-caligraphic" mathvariant="script">Z</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msub> <mo>=</mo> <mn>1</mn> </math></EquationSource> </InlineEquation> and spin-polarized conducting surface states. Importantly, we identify three-dimensional saddle point van Hove singularities with substantial flat energy dispersion at the Fermi level, which can enhance superconductivity. Our results highlight a rich interplay between superconductivity and nontrivial electronic states in Al<sub>13</sub>Os<sub>4</sub>, demonstrating it as a unique platform for exploring unconventional superconducting states in quasicrystalline materials.</p>

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Observation of superconductivity in a nontrivial \({{{{\mathcal{Z}}}}}_{2}\) approximant quasicrystal

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月17日

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  • Pavan Kumar Meena,
  • Rahul Verma,
  • Arushi,
  • Sonika Jangid,
  • Roshan Kumar Kushwaha,
  • Rhea Stewart,
  • Adrian D. Hillier,
  • Bahadur Singh,
  • Ravi Prakash Singh

摘要

Superconductivity and nontrivial topology are highly sought-after phenomena in quantum materials. While many topological crystalline materials have been found to exhibit superconductivity, their presence in quasicrystals—materials with a unique aperiodic yet ordered structure—has remained largely unexplored. In this work, we report the discovery of superconductivity in a monoclinic approximant to the decagonal quasicrystal Al13Os4, that exhibits a high superconducting transition temperature and a nontrivial electronic structure. The resistivity, magnetization, specific heat, and μSR measurements confirm superconductivity with a critical temperature of ~5.47 K. Detailed electronic structure and symmetry analysis reveal nontrivial state with \({{{{\mathcal{Z}}}}}_{2}=1\) Z 2 = 1 and spin-polarized conducting surface states. Importantly, we identify three-dimensional saddle point van Hove singularities with substantial flat energy dispersion at the Fermi level, which can enhance superconductivity. Our results highlight a rich interplay between superconductivity and nontrivial electronic states in Al13Os4, demonstrating it as a unique platform for exploring unconventional superconducting states in quasicrystalline materials.