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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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Novel magnesium borides and their superconductivity.

M Mahdi Davari Esfahani1, Qiang Zhu, Huafeng Dong

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Researchers explored magnesium-boron compounds under high pressure, discovering new stable phases like MgB3 and Mg3B10. Most new superconductors exhibit low critical temperatures (Tc) below 3 K.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • The search for novel superconducting materials is crucial for technological advancements.
  • Magnesium-boron compounds are of interest due to the known superconductivity of MgB2.

Purpose of the Study:

  • To investigate the stable phases in the magnesium-boron (Mg-B) binary system.
  • To explore potential new superconductors within this system under high pressure.

Main Methods:

  • Ab initio evolutionary searches were employed to predict stable Mg-B compounds.
  • Calculations were performed across a pressure range of 0-200 GPa.

Main Results:

  • Discovery of new thermodynamically stable compounds: MgB3 and Mg3B10.
  • MgB2 is stable across the entire pressure range. MgB7 and MgB12 show pressure-dependent stability.
  • MgB4 exhibits predicted reentrant behavior, becoming unstable and then stable again at specific pressures.
  • Most identified magnesium borides, excluding MgB2, possess low electron-phonon coupling constants (λ ≈ 0.32-0.39) and predicted critical temperatures (Tc) below 3 K.

Conclusions:

  • The Mg-B system hosts previously unknown stable compounds under pressure.
  • While new phases were identified, their superconducting properties are predicted to be limited, with low Tc values for most, except potentially MgB2.