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Coexistence of superconductivity and ferromagnetism in P-doped EuFe2As2


Superconductivity in the pnictides and cuprates is always found in close proximity to an antiferromagnetic order and the superconducting pairing is believed to be mediated by the antiferromagntic spin fluctuations. For the superconducting EuFe2(As1−xPx)2 single-crystal samples, direct microscopic evidence for the proposed ferromagnetic and/or antiferromagnetic structure is still lacking. Due to the strong neutron absorption of Eu together with the small sample mass of the P-doped single crystals, the magnetic structure determination in EuFe2(As1−xPx)2 via neutron diffraction is considerably challenging.

We report on the first element-specific x-ray resonant magnetic scattering (XRMS) studies of the superconducting EuFe2(As1−xPx)2 to explore the details of the magnetic structure of the Eu2+ moments. Combining magnetic, thermodynamic, and scattering measurements, the long-range ferromagnetic order of the Eu2+ moments is aligned primarily along the c axis and coexists with the bulk superconductivity at zero field. We propose a spontaneous vortex state for the coexistence of superconductivity and ferromagnetism in EuFe2(As0.85P0.15)2.

S. Nandi et al., “Coexistence of Superconductivity and Ferromagnetism in P-doped EuFe2As2”, Phys. Rev. B 89, 014512 (2014).

Contact: Yixi Su

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