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arXiv · 1401.5463

Coexistence of Superconductivity and Ferromagnetism in P-doped EuFe2As2

S. Nandi·W. T. Jin·Y. Xiao·Y. Su·S. Price·D. K. Shukla·J. Strempfer·H. S. Jeevan·P. Gegenwart·Th. Brückel
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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.

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S. Nandi, W. T. Jin, Y. Xiao, Y. Su, S. Price, D. K. Shukla, J. Strempfer, H. S. Jeevan, P. Gegenwart, Th. Brückel. 2014-01-22. Coexistence of Superconductivity and Ferromagnetism in P-doped EuFe2As2. https://doi.org/10.1103/physrevb.89.014512

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