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Superconductivity in an infinite-layer nickelate.

Danfeng Li1,2, Kyuho Lee3,4, Bai Yang Wang3,4

  • 1Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA. denverli@stanford.edu.

Nature
|August 30, 2019
PubMed
Summary
This summary is machine-generated.

Researchers discovered superconductivity in infinite-layer nickelates, a new class of materials. This finding opens possibilities for novel superconductors analogous to copper oxides, advancing the search for high-temperature superconductivity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Unconventional superconductivity in copper oxides (e.g., (La,Ba)2CuO4) motivates research into similar materials.
  • Isostructural compounds like Sr2RuO4 and Sr2IrO4 show superconducting properties or signatures, but zero-resistance states are elusive.
  • Theoretical studies and thin-film heterostructures (e.g., LaAlO3/LaNiO3) explore artificial nickelate superconductors.

Purpose of the Study:

  • To discover new superconductors by investigating materials with crystal and electronic structures similar to copper oxides.
  • To explore the potential of artificially layered nickelate heterostructures for superconductivity.
  • To understand the origins of superconductivity in copper oxide-like materials.

Main Methods:

  • Synthesis of infinite-layer nickelate single-crystal thin films (NdNiO2 and Nd0.8Sr0.2NiO2) using soft-chemistry topotactic reduction.
  • Characterization of material properties through resistivity measurements.
  • Analysis of critical current density and magnetic-field response to confirm superconductivity.

Main Results:

  • Superconductivity observed in an infinite-layer nickelate, Nd0.8Sr0.2NiO2, isostructural to infinite-layer copper oxides.
  • Nd0.8Sr0.2NiO2 exhibits a superconducting transition temperature (Tc) between 9 and 15 Kelvin.
  • NdNiO2 showed a resistive upturn at low temperatures, unlike the superconducting Nd0.8Sr0.2NiO2.

Conclusions:

  • The discovery of superconductivity in Nd0.8Sr0.2NiO2 establishes a new family of nickelate superconductors.
  • These findings suggest a potential analogy between nickelate and copper oxide superconductors.
  • Further research into reduced layered nickelate crystal structures may yield additional superconductors.