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Superconductor01:24

Superconductor

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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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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Superconductivity in (Ba,K)SbO3.

Minu Kim1, Graham M McNally2, Hun-Ho Kim2

  • 1Max Planck Institute for Solid State Research, Stuttgart, Germany. minukim@fkf.mpg.de.

Nature Materials
|March 1, 2022
PubMed
Summary
This summary is machine-generated.

Researchers discovered superconductivity in (Ba,K)SbO3, a new material with potential for advanced applications. This finding offers insights into the mechanisms behind charge density wave order and superconductivity in perovskite materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Barium potassium bismuthate ((Ba,K)BiO3) exhibits high superconducting transition temperatures (Tc) near charge density wave (CDW) order, but the underlying mechanism is not fully understood.
  • Understanding the interplay between CDW and superconductivity is crucial for designing novel superconducting materials.

Purpose of the Study:

  • To investigate superconductivity in a new material, (Ba,K)SbO3, and explore its relationship with charge density wave order.
  • To determine if oxygen-metal covalency plays a role in main-group perovskite superconductors.

Main Methods:

  • High-pressure synthesis was employed to create the (Ba,K)SbO3 material.
  • Systematic potassium substitution was used to suppress the charge density wave order and observe the emergence of superconductivity.

Main Results:

  • Superconductivity was observed in (Ba,K)SbO3, which exhibits a positive oxygen-metal charge transfer energy, unlike (Ba,K)BiO3.
  • The parent compound BaSbO3-δ showed a larger charge density wave gap than BaBiO3.
  • Superconductivity emerged with a Tc of 15 K upon suppressing the CDW order via potassium substitution up to 65%.

Conclusions:

  • The discovery of superconductivity and an enhanced CDW gap in (Ba,K)SbO3 suggests that strong oxygen-metal covalency is important for main-group perovskite superconductors.
  • This finding challenges the notion that the sign of the charge transfer energy is the primary factor in these materials.