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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Superconductivity from buckled-honeycomb-vacancy ordering.

Yanpeng Qi1, Tianping Ying2, Xianxin Wu3

  • 1School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.

Science Bulletin
|January 19, 2023
PubMed
Summary
This summary is machine-generated.

Researchers discovered a novel vacancy ordering in Ir16Sb18, which suppresses superconductivity. This ordering can be overcome by introducing more Ir atoms or Rh substitution, revealing a competition between vacancy ordering and superconductivity.

Keywords:
IridatesPhase diagramSuperconductivityVacancies

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Area of Science:

  • Solid-state physics
  • Materials science
  • Condensed matter physics

Background:

  • Vacancies are common defects in solids but their role in strongly correlated materials is unexplored.
  • Understanding vacancy behavior is crucial for designing novel materials with desired properties.

Purpose of the Study:

  • To investigate the role of vacancies in strongly correlated materials.
  • To discover and characterize novel vacancy ordering phenomena.
  • To explore the relationship between vacancy ordering and superconductivity.

Main Methods:

  • Experimental synthesis and characterization of Ir16Sb18.
  • Investigating the effects of chemical substitution (Rh) and pressure (squeezing Ir atoms).
  • Theoretical calculations including density of states and Fermi surface nesting analysis.

Main Results:

  • Discovery of an unprecedented buckled-honeycomb-vacancy (BHV) ordering in Ir16Sb18.
  • Superconductivity emerges upon suppression of BHV ordering via Ir doping or Rh substitution.
  • Phase diagram shows competition between BHV ordering and superconductivity.
  • Theoretical analysis indicates BHV ordering arises from vacancy formation energy and Fermi surface nesting.

Conclusions:

  • The study reveals the significant impact of correlated vacancies on material properties.
  • BHV ordering breaks crystal inversion symmetry and affects electronic states near the Fermi level.
  • This work provides a new paradigm for exploring exotic phenomena like quantum criticality and non-trivial excitations.