来源 自动抓取
作者 Z. J. Li, R . Z. Zhang, M. H. Xu, K. Y. Liang, Y. Zhao, Q. S. He, Q. Z. Zhou, B. R. Chen, P. H. Zhang, K. Z. Yao, H. X. Yao, L. Qiao, Y. H. Wang
arXiv / 出版方 http://arxiv.org/abs/2601.12676v1
PDF https://arxiv.org/pdf/2601.12676v1
相关度评分 5.088
主分类 本批次暂无数据。
发布日期 本批次暂无数据。
研究范式 实验研究
样品形态 薄膜

摘要

该研究利用扫描超导量子干涉显微镜对无限层镍基超导体Nd0.8Sr0.2NiO2薄膜进行局域磁化率与磁通成像，以揭示零温超流密度与超导转变温度之间的关联。由于样品存在微米尺度的不均匀性，研究通过空间统计分析发现：当局部T_c高于8K时，T_c与ρ_s0呈线性关系；而当T_c低于8K时，二者呈亚线性依赖（近似T_c∝ρ_s01/2）。这一整体关系与过掺杂铜氧化物超导体中的观测结果高度相似，暗示了无限层镍基超导体与铜氧化物超导体在超导机制上可能存在密切的内在联系。

材料

方法

  • Scanning superconducting quantum interference device (sSQUID) microscopy
  • Susceptometry
  • Magnetometry
  • Mutual inductance

关键词

亮点

  • This work proposes a high-efficiency methodology of susceptometry imaging combined with spatial statistics to acquire continuous and dense Tc(ρs0) data from a single sample.
  • The linear scaling for Tc>8 K suggests significant thermal phase fluctuations in Nd0.8Sr0.2NiO2.

结论

  • Local Tc exhibits a linear relationship with ρs0 for Tc>8 K and a sublinear one (Tc ∝ ρs0^(1/2)) for Tc<8 K.
  • The overall relationship is reminiscent of that reported in overdoped cuprate superconductors.
  • This suggests a potentially intimate intrinsic connection between the superconducting mechanisms of infinite-layer nickelate and cuprate superconductors.

主要论断

  • Local Tc and zero-temperature superfluid density in Nd0.8Sr0.2NiO2 show a linear relationship for Tc > 8 K and sublinear (Tc ∝ ρs01/2) for Tc < 8 K.
    • 证据: Abstract: 'spatial statistical analysis revealed that when the local Tc exceeds 8 K, Tc exhibits a linear relationship with ρs0; conversely, when Tc is below 8 K, the dependence becomes sublinear'
  • This behavior is reminiscent of overdoped cuprate superconductors, suggesting a close intrinsic connection between the superconducting mechanisms.
    • 证据: Abstract: 'This overall behavior closely resembles observations in overdoped cuprate superconductors, suggesting a potentially intimate intrinsic connection'

研究流程

  • Sample growth and characterization
    • 材料: Nd0.8Sr0.2NiO2 thin films on SrTiO3 (001)
    • 方法: Pulsed laser deposition; Topotactic reduction
    • 观察: High-quality films with Tc up to 12.6K; Linear-in-temperature resistivity from 100-300K
  • Scanning SQUID microscopy
    • 材料: Thin films
    • 方法: Local susceptometry and magnetometry; Variable temperature
    • 观察: Inhomogeneous superfluid density and Tc on micron scale; Weakly diamagnetic rings
  • Data analysis and scaling — Tc-superfluid density relation in NSNO resembles overdoped cuprates
    • 材料: Susceptibility and Tc maps
    • 方法: Thin diamagnet film model; Spatial statistics; Extrapolation to zero temperature
    • 观察: Tc ∝ ρs0 for Tc > 8K; Tc ∝ √ρs0 for Tc < 8K