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Linear-in-temperature resistivity for optimally superconducting (Nd,Sr)NiO2.

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Researchers synthesized defect-free infinite-layer nickelates, revealing normal state properties similar to copper oxides. This advancement enhances superconductivity in nickelates, suggesting a convergence between these superconducting families.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Superconductivity near strongly correlated phases is key to understanding emergent phenomena.
  • Layered nickelates show promise for superconductivity, but materials limitations hinder research.
  • Defects in infinite-layer nickelate films complicate transport measurements.

Purpose of the Study:

  • To overcome materials limitations in infinite-layer nickelates.
  • To investigate the normal state properties of defect-free nickelates.
  • To understand the relationship between defects and superconductivity in nickelates.

Main Methods:

  • Synthesized Nd1-xSrxNiO2 thin films on a novel substrate ((LaAlO3)0.3(Sr2TaAlO6)0.7).
  • Achieved synthesis essentially free from extended defects.
  • Performed transport measurements on the defect-minimized nickelate series.

Main Results:

  • Defect-free nickelates exhibit distinct normal state resistivity behaviors (upturn, linear, quadratic) across doping levels.
  • Observed phenomenological similarities to copper oxides, despite electronic structure differences.
  • Enhanced superconducting transition temperature and doping range in defect-minimized nickelates.

Conclusions:

  • Reducing disorder in nickelates reveals electronic properties converging with copper oxides.
  • The novel substrate enables high-quality synthesis of infinite-layer nickelates.
  • These findings pave the way for deeper understanding of nickelate superconductivity.