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Superconducting Properties of GdFeAsO at High Pressure

Journal of Superconductivity and Novel Magnetism, ISSN: 1557-1947, Vol: 29, Issue: 4, Page: 1105-1110
2016
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Metrics Details

  • Citations
    7
    • Citation Indexes
      7
  • Captures
    10

Article Description

We report hydrostatic pressure studies up to 5.3 GPa on pressure synthesized GdFeAsO polycrystalline sample by electrical resistivity, magnetic ac-susceptibility, and ac-specific heat measurements. The superconducting transition temperature (T) is suppressed dramatically from 53 K at ambient pressure to 36 K at 5.3 GPa. We find that the magnetic ordering temperature (T=2.4 K) of Gd sublattice determined by specific heat is nearly pressure independent. Also, the superconducting volume fraction estimated by ac-susceptibility data does not change in the pressure range studied. At ambient pressure, the specific heat jump at the TΔC/T = 18.3 mJ/mole K is comparable to that found in SmFeAsOF and SmFeAsO. At high pressure, the amplitude of the specific heat jump decreases together with the decrease of T and conforms with the universal scaling law of (Formula presented.) found in a number of 122 iron pnictide superconductors.

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