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Pressure-induced superconductivity in Ba0.5Sr0.5Fe2As2.

Georgiy M Tsoi1, Walter Malone, Walter Uhoya

  • 1Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 14, 2012
PubMed
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High pressure induces superconductivity in Ba(0.5)Sr(0.5)Fe(2)As(2), with a transition temperature peaking at 31 K. This phenomenon, observed in a solid solution of 122-type materials, diminishes at higher pressures.

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Area of Science:

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

Background:

  • Barium iron arsenide (BaFe2As2) and strontium iron arsenide (SrFe2As2) are 122-type superconductors.
  • Solid solutions of these materials, like Ba(1-x)Sr(x)Fe2As2, are explored for novel superconducting properties.

Purpose of the Study:

  • To investigate the effects of high pressure on the electrical resistance of Ba(0.5)Sr(0.5)Fe2As2.
  • To determine if pressure-induced superconductivity can be achieved in this specific solid solution.

Main Methods:

  • Single crystal Ba(0.5)Sr(0.5)Fe2As2 platelets were subjected to electrical resistance measurements.
  • Measurements were conducted under quasi-hydrostatic conditions up to 16 GPa using designer diamond anvils and a steatite pressure medium.
  • Temperatures were lowered down to 10 K.

Main Results:

  • Superconductivity was induced by pressure, with an onset transition temperature of approximately 31 K and zero resistance at 22 K observed at 3.3 GPa.
  • The superconducting transition temperature gradually decreased with increasing pressure.
  • Superconductivity was no longer observed above 12 GPa.

Conclusions:

  • High pressure can induce superconductivity in the solid solution Ba(0.5)Sr(0.5)Fe2As2.
  • These findings support the hypothesis that solid solutions of 122-type materials (Ba(1-x)Sr(x)Fe2As2) can exhibit pressure-induced superconductivity.