Interplay of magnetism and superconductivity in EuFe2(As1-xPx)2 single crystals probed by muon spin rotation and 57Fe M?ssbauer spectroscopy

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Goltz, T.^1 ; Kamusella, S.^1 ; Jeevan, H.S.^2 ; Gegenwart, P.^2,4 ; Luetkens, H.^3 ; Materne, P.^1 ; Spehling, J.^1 ; Sarkar, R.^1 ; Klauss, H.-H.^1

Technical University of Dresden, Institute of Solid State Physics, Germany^1

I. Physik. Institut, Georg-August Universität Gottingen, Germany^2

Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen, Switzerland^3

Exp. Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, Germany^4

关键词: Antiferromagnetic transition;    Bulk superconductivity;    Local probes;    Muon spin rotation;    Ssbauer spectroscopies;    Sub-lattices;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012025/pdf
DOI  :  10.1088/1742-6596/551/1/012025

来源: IOP

【 摘 要 】

We present our results of a local probe study on EuFe2(As1-xPx)2 single crystals with x=0.13, 0.19 and 0.28 by means of muon spin rotation and57Fe Mössbauer spectroscopy. We focus our discussion on the sample with x=0.19 viz. at the optimal substitution level, where bulk superconductivity (TSC 28 K) sets in above static europium order (TEu20 K) but well below the onset of the iron antiferromagnetic (AFM) transition (∼100 K). We find enhanced spin dynamics in the Fe sublattice closely above TSC and propose that these are related to enhanced Eu fluctuations due to the evident coupling of both sublattices observed in our experiments.