Pressure-induced magnetism in iron-based superconductors $A$Fe${}_2$As${}_2$ ($A=$ K, Cs, Rb)

Abstract

The magnetic properties of iron-based superconductors $A$Fe${}_2$As${}_2$ ($A=$K, Cs, and Rb), which are characterized by the V-shaped dependence of the critical temperature ($T_{\mathrm{c}}$) on pressure ($P$) were studied by means of the muon spin rotation/relaxation technique. In all three systems studied the magnetism was found to appear for pressures slightly below the critical one ($P_{\mathrm{c}}$), i.e. at pressure where $T_{\mathrm{c}}(P)$ changes the slope. Rather than competing, magnetism and superconductivity in $A$Fe${}_2$As${}_2$ are coexisting at $P\gtrsim P_{\mathrm{c}}$ pressure region. Our results support the scenario of a transition from one pairing state to another, with different symmetries on either side of $P_{\mathrm{c}}$.

7 pages, 3 figures

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Cited by in corpus (2)

• Perspective on the muon-spin rotation/relaxation under hydrostatic pressure
• Suppressed fluctuations as the origin of the static magnetic order in strained Sr${}_2$RuO${}_4$