Coexistence of superconductivity and ferromagnetism in P-doped EuFe$_2$As$_2$

Nandi, S.; Jin, Wentao; Brückel, Th.; Xiao, Y.; Price, S.; Strempfer, J.; Gegenwart, P.; Shukla, D. K.; Su, Y.; Jeevan, H. S.

doi:10.1103/PhysRevB.89.014512

Journal Article

FZJ-2014-01272

Coexistence of superconductivity and ferromagnetism in P-doped EuFe$_2$As$_2$

Nandi, S. (Corresponding author)FZJ* ; Jin, W.FZJ* ; Xiao, Y.FZJ* ; Su, Y.FZJ* ; Price, S.FZJ* ; Shukla, D. K. ; Strempfer, J. ; Jeevan, H. S. ; Gegenwart, P. ; Brückel, T.FZJ*

2014
APS College Park, Md.

Physical review / B 89(1), 014512 (2014) [10.1103/PhysRevB.89.014512]

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Please use a persistent id in citations: http://hdl.handle.net/2128/5918 doi:10.1103/PhysRevB.89.014512

Abstract: The magnetic structure of the Eu2+ moments in the superconducting EuFe2(As1−xPx)2 sample with x=0.15 has been determined using element-specific x-ray resonant magnetic scattering. Combining magnetic, thermodynamic, and scattering measurements, we conclude that the long-range ferromagnetic order of the Eu2+ moments aligned primarily along the c axis coexists with the bulk superconductivity at zero field. At an applied magnetic field ≥0.6 T, superconductivity still coexists with the ferromagnetic Eu2+ moments, which are polarized along the field direction. We propose a spontaneous vortex state for the coexistence of superconductivity and ferromagnetism in EuFe2(As0.85P0.15)2.

Keyword(s): Magnetic Materials (1st) ; Key Technologies (1st) ; Information Technology and Functional Materials (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd)