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We report muon spin rotation and magnetization measurements on the magneticsuperconductor RbEuFe$_{4}$As$_{4}$ under hydrostatic pressures up to 3.8 GPa.At ambient pressure, RbEuFe$_{4}$As$_{4}$ exhibits a superconducting transitionat $T_{c} \approx$ 36.5 K and a magnetic transition at $T_{m} \approx$ 15 Kbelow which the magnetic and the superconducting order coexist. With increasingpressure, $T_{c}$ decreases while $T_{m}$ and the ordered Eu magnetic momentincrease. In contrast to iron-based superconductors with ordering Fe moments,the size of the ordered Eu moment is not proportional to $T_{m}$. The muon spinrotation signal is dominated by the magnetic response impeding thedetermination of the superconducting properties.

Muon spin rotation measurements on RbEuFe$_{4}$As$_{4}$ under pressure