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<p>Magneto-optical measurements in La<sub>0.8</sub>Sr<sub>0.2</sub>NiO<sub>2</sub> and Nd<sub>0.825</sub>Sr<sub>0.175</sub>NiO<sub>2</sub> reveal an intriguing new facet of infinite-layer nickelate superconductors: the onset of spin-glass behavior at a temperature far exceeding the superconducting critical temperature <i>T</i><sub><i>c</i></sub>. This discovery sharply contrasts with copper oxide superconductors, where magnetism and superconductivity remain largely exclusive. Moreover, the magnitude and onset temperature of the polar Kerr effect in Nd<sub>0.825</sub>Sr<sub>0.175</sub>NiO<sub>2</sub> fabricated on SrTiO<sub>3</sub> and (LaAlO<sub>3</sub>)<sub>0.3</sub>(Sr<sub>2</sub>TaAlO<sub>6</sub>)<sub>0.7</sub> substrates differ dramatically, while <i>T</i><sub><i>c</i></sub> does not.</p>

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Spin-glass state in nickelate superconductors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月28日

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  • David R. Saykin,
  • Martin Gonzalez,
  • Jennifer Fowlie,
  • Steven A. Kivelson,
  • Harold Y. Hwang,
  • Aharon Kapitulnik

摘要

Magneto-optical measurements in La0.8Sr0.2NiO2 and Nd0.825Sr0.175NiO2 reveal an intriguing new facet of infinite-layer nickelate superconductors: the onset of spin-glass behavior at a temperature far exceeding the superconducting critical temperature Tc. This discovery sharply contrasts with copper oxide superconductors, where magnetism and superconductivity remain largely exclusive. Moreover, the magnitude and onset temperature of the polar Kerr effect in Nd0.825Sr0.175NiO2 fabricated on SrTiO3 and (LaAlO3)0.3(Sr2TaAlO6)0.7 substrates differ dramatically, while Tc does not.