Pressure-temperature phase diagrams of CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ superconductors

Abstract

The pressure dependence of the magnetic and superconducting transitions, as well as that of the superconducting upper critical field is reported for CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$, the first example of an Fe-based superconductor with spin-vortex-crystal-type magnetic ordering. Resistance measurements were performed on single crystals with two substitution levels ($x=0.033,0.050$) under hydrostatic pressures up to 5.12 GPa and in magnetic fields up to 9 T. Our results show that, for both compositions, magnetic transition temperatures, $T_{\text{N}}$, are suppressed upon applying pressure, the superconducting transition temperatures $T_{\text{c}}$ are suppressed by pressure as well, except for $x=0.050$ in the pressure region where $T_{\text{N}}$ and $T_{\text{c}}$ cross. Furthermore, the pressure associated with the crossing of the $T_{\text{N}}$ and $T_{\text{c}}$ 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 $p\sim$ 4 GPa, both Ni-substituted CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ samples likely go through a half-collapsed-tetragonal (hcT) phase transition, similar to the parent compound CaKFe${}_4$As${}_4$.

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• Bulk superconductivity and role of fluctuations in the iron-based superconductor FeSe at high pressures
• High Tc superconductivity in CaKFe${}_4$As${}_4$ in absence of nematic fluctuations
• Observation of Two Collapsed Phases in CaRbFe4As4
• Superconductivity and phase diagrams of CaK(Fe${}_{1-x}$Mn${}_x$)${}_4$As${}_4$ single crystals
• Pressure-induced multiple phase transformations of the BaBi${}_3$ superconductor
• Pressure-temperature phase diagram of EuRbFe${}_4$As${}_4$ superconductor
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• Pressure-temperature phase diagram of CaK(Fe${}_{1-x}$Mn${}_x$)${}_4$As${}_4$ for $x$=0.024