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.

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

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• Magnetic phase diagram of Ca-substituted EuFe${}_2$As${}_2$
• Suppression of the magnetic order in CeFeAsO: non-equivalence of hydrostatic and chemical pressure