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Superconductivity in a quintuple-layer square-planar nickelate.

Grace A Pan1, Dan Ferenc Segedin1, Harrison LaBollita2

  • 1Department of Physics, Harvard University, Cambridge, MA, USA.

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|November 23, 2021
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a new quintuple-layer nickelate, Nd6Ni5O12, achieving superconductivity at 13 K without doping. This discovery highlights square-planar nickelates as a tunable new family of superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • High-temperature superconductivity in copper oxides remains a key research area.
  • Rare-earth nickelates are a promising platform for discovering new superconductors.
  • Superconductivity was recently found in doped Nd0.8Sr0.2NiO2, an infinite-layer nickelate.

Purpose of the Study:

  • To synthesize and characterize a new quintuple-layer nickelate, Nd6Ni5O12.
  • To investigate the superconducting properties of Nd6Ni5O12.
  • To explore the potential of square-planar nickelates as a tunable superconducting material family.

Main Methods:

  • Synthesis of quintuple-layer nickelate Nd6Ni5O12.
  • Measurement of superconducting transition temperature (~13 K).
  • Electronic structure calculations, magnetoresistive, and spectroscopic measurements.

Main Results:

  • Successful synthesis of Nd6Ni5O12 with optimal cuprate-like electron filling (d8.8) without doping.
  • Observation of superconductivity with a transition onset at approximately 13 K.
  • Evidence that Nd6Ni5O12 exhibits behavior intermediate between cuprate-like and infinite-layer nickelate characteristics.

Conclusions:

  • Square-planar nickelates represent a new family of superconductors.
  • Superconductivity in this class of materials can be tuned by doping and dimensionality.
  • Nd6Ni5O12 serves as a distinct example, bridging behaviors between different nickelate structures.