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

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 ( $T_{c}$ ) 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_{\rm c} $), i . e . a t p r e s s u r e w h e r e$ T_{\rm c}(P)$ changes the slope. Rather than competing, magnetism and superconductivity in $A$ Fe $_{2}$ As $_{2}$ are coexisting at $P ≳ P_{c}$ pressure region. Our results support the scenario of a transition from one pairing state to another, with different symmetries on either side of $P_{c}$ .

Pressure-induced magnetism in iron-based superconductors $A$ Fe $_{2}$ As $_{2}$ ( $A =$ K, Cs, Rb)

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Pressure-induced magnetism in iron-based superconductors $A$ Fe $_{2}$ As $_{2}$ ( $A =$ K, Cs, Rb)

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Pressure-induced magnetism in iron-based superconductors AAFe22​As22​ (A=A= K, Cs, Rb)

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Pressure-induced magnetism in iron-based superconductors AAFe22​As22​ (A=A= K, Cs, Rb)

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Pressure-induced magnetism in iron-based superconductors $A$ Fe $_{2}$ As $_{2}$ ( $A =$ K, Cs, Rb)

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Pressure-induced magnetism in iron-based superconductors $A$ Fe $_{2}$ As $_{2}$ ( $A =$ K, Cs, Rb)

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