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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Robust Superconductivity in Infinite-Layer Nickelates.

Minghui Xu1, Yan Zhao1, Yu Chen1

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|April 30, 2024
PubMed
Summary
This summary is machine-generated.

Nickelate superconductors with ultralow Ni1+ valence are robust. Their stability depends on the perovskite precursor quality, not the Ni1+ state, suggesting potential for sustainable device applications.

Keywords:
nickelatesreversiblesuperconductortopological relationships

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • Unconventional high-temperature superconductivity is a key area of research.
  • Nickelate superconductors, particularly infinite-layer structures, present synthesis challenges.
  • The stability of Ni1+ in these materials is an open question.

Purpose of the Study:

  • To investigate the robustness and stability of infinite-layer nickelate superconductors under redox cycling.
  • To determine if the ultralow Ni1+ valence state is a limiting factor for nickelate superconductivity.
  • To assess the role of the perovskite precursor quality in the stability of nickelate superconductors.

Main Methods:

  • Redox cycling experiments were performed on perovskite Nd0.8Sr0.2NiO3 and infinite-layer Nd0.8Sr0.2NiO2.
  • Crystallographic quality was monitored throughout the cycling process.
  • Phase transitions between perovskite and infinite-layer structures were analyzed.

Main Results:

  • Infinite-layer Nd0.8Sr0.2NiO2 demonstrated significant robustness, maintaining crystallographic quality after multiple redox cycles.
  • Perovskite Nd0.8Sr0.2NiO3 precursors showed structural degradation with increasing cycling.
  • The stability of nickelate superconductivity was found to be dependent on the precursor quality, not the Ni1+ valence state.

Conclusions:

  • Infinite-layer nickelate superconductors are robust in redox environments.
  • The quality of the perovskite precursor is critical for the stability of nickelate superconductivity.
  • High-quality precursors could lead to stable and sustainable infinite-layer nickelate superconductors for device applications.