Abstract
We report hydrostatic pressure studies up to 5.3 GPa on pressure synthesized GdFeAsO0.85 polycrystalline sample by electrical resistivity, magnetic ac-susceptibility, and ac-specific heat measurements. The superconducting transition temperature (T C) is suppressed dramatically from 53 K at ambient pressure to 36 K at 5.3 GPa. We find that the magnetic ordering temperature (T N=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 T CΔC/T C = 18.3 mJ/mole K2 is comparable to that found in SmFeAsO0.85 F 0.15 and SmFeAsO0.6. At high pressure, the amplitude of the specific heat jump decreases together with the decrease of T C and conforms with the universal scaling law of \(\Delta C/T_{\mathrm {C}} \propto {T}_{\mathrm {C}}^{2}\) found in a number of 122 iron pnictide superconductors.
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Acknowledgments
This work was supported by the program Strongly correlated electrons of the Department of Physical Sciences of Russian Academy of Sciences. The work in China was supported by the NSF of China (Grant No. 91321207 and 11427805).
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Zhou, Y., Sidorov, V.A., Petrova, A.E. et al. Superconducting Properties of GdFeAsO0.85 at High Pressure. J Supercond Nov Magn 29, 1105–1110 (2016). https://doi.org/10.1007/s10948-016-3382-9
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DOI: https://doi.org/10.1007/s10948-016-3382-9