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Pressure-temperature phase diagrams of CaK(Fe1-xNix)(4)As-4 superconductors

TitlePressure-temperature phase diagrams of CaK(Fe1-xNix)(4)As-4 superconductors
Publication TypeJournal Article
Year of Publication2018
AuthorsXiang, L, Meier, WR, Xu, MY, Kaluarachchi, US, Bud'ko, SL, Canfield, PC
JournalPhysical Review B
Date Published05
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000433025900001
Keywordsbafe2as2, cell, physics

n magnetic fields up to 9 T. Our results show that, for both compositions, magnetic transition temperatures T-N are suppressed upon applying pressure; the superconducting transition temperatures T-c are suppressed by pressure as well, except for x = 0.050 in the pressure region where T-N and T-c cross. Furthermore, the pressure associated with the crossing of the T-N and T-c lines also coincides with a minimum in the normalized slope of the superconducting upper critical field, consistent with a likely Fermi-surface reconstruction associated with the loss of magnetic ordering. Finally, at p similar to 4 GPa, both Ni-substituted CaK(Fe1-xNix)(4)As-4 samples likely go through a half-collapsed-tetragonal phase transition, similar to the parent compound CaKFe4As4.

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