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Pressure induced superconductivity in CaFe2As2.

Milton S Torikachvili1, Sergey L Bud'ko, Ni Ni

  • 1Department of Physics, San Diego State University, San Diego, CA 92182-1233, USA.

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

Hydrostatic pressure dramatically alters CaFe2As2, revealing FeAs superconductivity. Superconductivity emerges around 5 kbar as phase transitions are tuned by pressure.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Calcium iron arsenide (CaFe2As2) exhibits complex phase transitions sensitive to external stimuli.
  • FeAs-based materials are a key class of superconductors, but their properties are often modulated by disorder.

Purpose of the Study:

  • To investigate the effects of hydrostatic pressure on the phase transitions and superconductivity in CaFe2As2.
  • To explore the possibility of inducing superconductivity in CaFe2As2 without introducing chemical disorder.

Main Methods:

  • Single-crystal X-ray diffraction
  • Resistivity measurements under hydrostatic pressure
  • Magnetic susceptibility measurements

Main Results:

  • The ambient pressure structural/magnetic transition at 170 K is suppressed to 128 K by 3.5 kbar.
  • A new transition appears at 104 K at 5.5 kbar, shifting to above 300 K by 19 kbar.
  • A superconducting dome with a critical temperature (T(c)) of approximately 12 K is observed, centered around 5 kbar and spanning 2.3 to 8.6 kbar.

Conclusions:

  • Hydrostatic pressure is an effective tool to tune the electronic and magnetic properties of CaFe2As2.
  • Superconductivity in CaFe2As2 emerges in a pressure-induced phase where the low-pressure transition is suppressed and the high-pressure transition has not yet dominated.
  • This pressure-induced superconductivity provides a disorder-free route to studying FeAs-based superconducting mechanisms.