Reentrant phases in electron-doped ${\text{EuFe}}_2{\text{As}}_2$: spin glass and superconductivity

Abstract

We report evidence for a reentrant spin glass phase in electron-doped ${\text{EuFe}}_2{\text{As}}_2$ single crystals and first traces of the superconductivity re-entrance in optics. In the close-to-optimal doped $\text{Eu}({\text{Fe}}_{0.91}{\text{Ir}}_{0.09}{)}_2{\text{As}}_2$ and $\text{Eu}({\text{Fe}}_{0.93}{\text{Rh}}_{0.07}{)}_2{\text{As}}_2$ samples two magnetic transitions are observed below the superconducting critical temperature $T_c\approx 21$~K: the canted $A$-type antiferromagnetic order of the ${\text{Eu}}^{2+}$ ions sets in around $17\text{K}$; the spin glass behavior occurs another $2\text{K}$ lower in temperature. In addition, strong evidence for an additional transition is found far below the spin glass temperature. Our extensive optical and magnetic investigations provide new insight into the interplay of local magnetism and superconductivity in these systems and elucidate the effect of the spin-glass phase on the reentrant superconducting state.

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Cited by in corpus (5)

• Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe${}_4$As${}_4$
• Unique interplay between superconducting and ferromagnetic orders in EuRbFe${}_4$As${}_4$
• Strongly anisotropic antiferromagnetic coupling in EuFe2As2 revealed by stress detwinning
• Band structure and Fermi surfaces of the reentrant ferromagnetic superconductor Eu(Fe0.86Ir0.14)2As2
• Electronic structure and $H$-$T$ phase diagram of Eu(Fe${}_{1-x}$Rh${}_x$)${}_2$As${}_2$