Interplay of magnetism and superconductivity in EuFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ single crystals probed by muon spin rotation and ${}^{57}$Fe Mössbauer spectroscopy

Abstract

We present our results of a local probe study on EuFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ single crystals with $x$=0.13, 0.19 and 0.28 by means of muon spin rotation and ${}^{57}$Fe Mössbauer spectroscopy. We focus our discussion on the sample with $x$=0.19 viz. at the optimal substitution level, where bulk superconductivity ($T_{\text{SC}}=28$ K) sets in above static europium order ($T^{\text{Eu}}=20$K) but well below the onset of the iron antiferromagnetic (AFM) transition ($\sim$100 K). We find enhanced spin dynamics in the Fe sublattice closely above $T_{\text{SC}}$ and propose that these are related to enhanced Eu fluctuations due to the evident coupling of both sublattices observed in our experiments.

Contribution to the 13th International Conference on Muon Spin Rotation, Relaxation and Resonance (MuSR2014)

References in corpus (6)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity in SrFe_(2-x)Co_xAs_2: Internal Doping of the Iron Arsenide Layers
• Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2
• Shape of spin density wave versus temperature in AFe2As2 (A=Ca, Ba, Eu): A Mössbauer study
• Unique phase diagram with narrow superconducting dome in EuFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ due to Eu${}^{2+}$ local magnetic moments
• Muon-spin rotation and magnetization studies of chemical and hydrostatic pressure effects in EuFe_{2}(As_{1-x}P_{x})_{2}

Cited by in corpus (1)

• Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals