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Hydrostatic pressure: A very effective approach to significantly enhance critical current density in granular iron pnictide superconductors

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons126847

Shekhar,  Chandra
Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Shabbir, B., Wang, X., Ghorbani, S. R., Shekhar, C., Dou, S., & Srivastava, O. N. (2015). Hydrostatic pressure: A very effective approach to significantly enhance critical current density in granular iron pnictide superconductors. Scientific Reports, 5: 8213, pp. 1-6. doi:10.1038/srep08213.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0025-B5C6-9
Zusammenfassung
Pressure is well known to significantly raise the superconducting transition temperature, T-c in both iron pnictides and cuprate based superconductors. Little work has been done, however, on how pressure can affect the flux pinning and critical current density in the Fe-based superconductors. Here, we propose to use hydrostatic pressure to significantly enhance flux pinning and T-c in polycrystalline pnictide bulks. We have chosen Sr4V2O6Fe2As2 polycrystalline samples as a case study. We demonstrate that the hydrostatic pressure up to 1.2 GPa can not only significantly increase T-c from 15 K (underdoped) to 22 K, but also significantly enhance the irreversibility field, H-irr, by a factor of 4 at 7 K, as well as the critical current density, J(c), by up to 30 times at both low and high fields. It was found that pressure can induce more point defects, which are mainly responsible for the J(c) enhancement. Our findings provide an effective method to significantly enhance T-c, J(c), Hirr, and the upper critical field, H-c2, for other families of Fe-based superconductors in the forms of wires/tapes, films, and single crystal and polycrystalline bulks.