Abstract
We report the pressure dependence of superconductivity for hole-doped polycrystalline Pr0.75Sr0.25FeAsO by the resistivity study using high pressure cubic and diamond anvil pressure cells. The superconducting transition temperature is initially increased from 17 K (P=0) to 34 K (P=6 GPa) with positive pressure coefficient, which is remarkable among other pnictide superconductors. At high pressure, there is no incredible enhancement of T c; in other words, it has a negative pressure effect on superconductivity, like in an electron-doped compounds. A systematic investigation of superconductivity for this 1111 type hole-doped iron pnictides is further carefully analyzed and discussed in detail using superconducting phase diagram under high pressure chart.
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Acknowledgements
This work was supported by the Japanese Ministry of Education, Sport and Culture (MEXT). We would like to acknowledge J. Jing and K. Tanigaki, WPI and Department of Physics, Graduate School of Science, Tohoku University for synthesizing the sample.
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Tamilselvan, N.R., Kanagaraj, M., Murata, K. et al. High Pressure Effect on Superconductivity of Hole-Doped Pr0.75Sr0.25FeAsO Iron Pnictides. J Supercond Nov Magn 27, 1381–1385 (2014). https://doi.org/10.1007/s10948-014-2478-3
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DOI: https://doi.org/10.1007/s10948-014-2478-3