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Pressure is well known to significantly raise the superconducting transitiontemperature, Tc, in both iron pnictides and cuprate based superconductors.Little work has been done, however, on how pressure can affect the flux pinningand critical current density in the Fe-based superconductors. Here, we proposeto use hydrostatic pressure to significantly enhance flux pinning and Tc inpolycrystalline pnictide bulks. We have chosen Sr4V2O6Fe2As2 polycrystallinesamples as a case study. We demonstrate that the hydrostatic pressure up to 1.2GPa can not only significantly increase Tc from 15 K (underdoped) to 22 K, butalso significantly enhance the irreversibility field, Hirr, by a factor of 4 at7 K, as well as the critical current density, Jc, by up to 30 times at both lowand high fields. It was found that pressure can induce more point defects,which are mainly responsible for the Jc enhancement. In addition, we found thatthe transformation from surface pinning to point pinning induced by pressurewas accompanied by a reduction of anisotropy at high temperatures. Our findingsprovide an effective method to significantly enhance Tc, Jc, Hirr, and theupper critical field, Hc2, for other families of Fe-based superconductors inthe forms of wires/tapes, films, and single crystal and polycrystalline bulks.

Hydrostatic pressure: A very effective approach to significantly enhance critical current density in granular Sr4V2O6Fe2As2 superconductor