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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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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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Is Ba3In2O6a high-Tsuperconductor?

F V E Hensling1,2, D Dahliah3,4, M A Smeaton1

  • 1Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 24, 2024
PubMed
Summary
This summary is machine-generated.

Barium indate (Ba3In2O6) was investigated for high-temperature superconductivity. Despite various doping and surface modification attempts, superconductivity was not induced, and oxygen interstitials hindered conductivity.

Keywords:
first-principles calculationshigh-Tc superconductivitymolecular-beam epitaxy

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Superconductivity Research

Background:

  • Barium indate (Ba3In2O6) has been theorized as a potential high-temperature superconductor.
  • Experimental studies were previously limited by the material's instability in air.
  • Recent advancements in epitaxial growth with protective capping layers enabled characterization.

Purpose of the Study:

  • To experimentally determine the electronic properties of Ba3In2O6.
  • To explore methods for inducing superconductivity in Ba3In2O6.
  • To understand the factors limiting conductivity in this material.

Main Methods:

  • Spectroscopic ellipsometry to measure the optical bandgap.
  • First-principles calculations for theoretical validation.
  • Various doping strategies (A-site, B-site, surface alkali doping).
  • Exploration of optical pumping, hydrogen reduction, and liquid-ion gating.
  • Scanning transmission electron microscopy (STEM) to analyze material structure.

Main Results:

  • The optical bandgap was measured as 2.99 eV (001 plane) and 2.83 eV (c-axis), consistent with theoretical calculations.
  • Neither A-site nor B-site doping successfully induced superconductivity.
  • Oxygen interstitials were identified as a primary obstacle to conductivity.
  • Surface modifications and advanced techniques like liquid-ion gating did not yield superconductivity.

Conclusions:

  • Ba3In2O6 is an insulator with a significant optical bandgap.
  • The formation of oxygen interstitials impedes efforts to achieve superconductivity.
  • Current experimental evidence does not support Ba3In2O6 as a high-temperature superconductor.