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Coexistence of superconductivity and magnetism

The discovery of iron-based superconductors has stimulated tremendous research interests in unconventional high-Tc superconductivity.  Among various parent compounds of iron pnictide superconductors, EuFe2As2 stands out due to the presence of both spin density wave of Fe and antiferromagnetic ordering of the localized Eu2+ moments. Superconductivity can be achieved in EuFe2As2 system by substituting As with P or by applying hydrostatic pressure. We have investigated the evolution of structure and magnetic ordering in EuFe2As2 using high-pressure single-crystal neutron-diffraction measurements.

We have shown that the long-range ordered Eu antiferromagnetism and pressure-induced superconductivity coexists in the EuFe2As2-based iron pnictides. This is quite rare since in the P-doped samples, it has been well established that superconductivity and ferromagnetism coexists.

Magnetic phase diagram for EuFe­As­2 Magnetic phase diagram for EuFe­As­2 under hydrostatic pressure. The transition temperatures, TC and TEu, are the superconducting and Eu antiferromagnetic ordering temperatures, respectively. TS and TSDW ­­denote structural phase transition and Fe SDW ordering temperatures, respectively.
Copyright: Forschungszentrum Jülich


  1. W. T. Jin, Y. Xiao, S. Nandi, S. Price, Y. Su, K. Schmalzl, W. Schmidt, T. Chatterji, A. Thamizhavel, and Th. Brückel, Coexistence of Eu antiferromagnetism and pressure-induced superconductivity in single-crystal EuFe2As2, Phys. Rev. B 100, 014503 (2019) 


Shibabrata Nandi
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