Pressure-temperature phase diagram of EuRbFe${}_4$As${}_4$ superconductor

Abstract

The pressure dependencies of the magnetic and superconducting transitions, as well as that of the superconducting upper critical field are reported for single crystalline EuRbFe${}_4$As${}_4$. Resistance measurements were performed under hydrostatic pressures up to 6.21 GPa and in magnetic fields up to 9 T. Zero-field-cool magnetization measurements were performed under hydrostatic pressures up to 1.24 GPa under 20 mT applied field. Superconducting transition temperature, $T_{\text{c}}$, up to 6.21 GPa and magnetic transition temperature, $T_{\text{M}}$, up to 1.24 GPa were obtained and a pressure-temperature phase diagram was constructed. Our results show that $T_{\text{c}}$ is monotonically suppressed upon increasing pressure. $T_{\text{M}}$ is linearly increased up to 1.24 GPa. For the studied pressure range, no signs of the crossing of $T_{\text{M}}$ and $T_{\text{c}}$ lines are observed. The normalized slope of the superconducting upper critical field is gradually suppressed with increasing pressure, which may be due to the continuous change of Fermi-velocity $v_F$ with pressure.

arXiv comment5 pages, 7 figures

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