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The superconducting properties of a recently discovered high $T_{\rm c}$superconductor, Sr/ammonia-intercalated FeSe, have been measured using pulsedmagnetic fields down to $4.\,\rm {K}$ and muon spin spectroscopy down to$1.5\,\rm K$. This compound exhibits intrinsic disorder resulting from randomstacking of the FeSe layers along the $c$-axis that is not present in otherintercalates of the same family. This arises because the coordinationrequirements of the intercalated Sr and ammonia moieties imply that theinterlayer stacking (along $c$) involves a translation of either ${\bf a}/2$ or${\bf b}/2$ which locally breaks tetragonal symmetry. The result of thisstacking arrangement is that the Fe ions in this compound describe abody-centred tetragonal lattice in contrast to the primitive arrangement of Feions described in all other Fe-based superconductors. In pulsed magnetic fieldsthe upper critical field $H_{\text{c2}}$ was found to increase on cooling withan upwards curvature that is commonly seen in type-II superconductors of amulti-band nature. Fitting the data to a two-band model and extrapolation toabsolute zero gave a maximum upper critical field ${\mu_0H_{\rm c2}(0)}$ of${33(2)\,\rm T}$. A clear superconducting transition with a diamagnetic shiftwas also observed in transverse-field muon measurements at ${T_{\textc}\approx36.3(2)\,\rm K}$. These results demonstrate that robustsuperconductivity in these intercalated FeSe systems does not rely on perfectstructural coherence along the $c$-axis.

Robustness of superconductivity to structural disorder in Sr$_{0.3}$(NH$_2$)$_{y}$(NH$_3$)$_{1-y}$Fe$_2$Se$_2$