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Hydrostatic pressure effects on the static magnetism in Eu(Fe0.925Co0.075)2As2

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Similar to the effect of chemical doping, the application of external pressure on iron-pnictides can lead to superconductivity as well. The effects of hydrostatic pressure on the static magnetism in non-superconducting Eu(Fe0.925Co0.075)2As2 are investigated by complementary electrical resistivity, ac magnetic susceptibility and single-crystal neutron diffraction measurements. A specific pressure-temperature (P-T) phase diagram of is established, as shown in the figure.

The structural phase transition, as well as the spin-density-wave order of Fe sublattice, is suppressed gradually with increasing pressure and disappears completely above 2.0 GPa. The magnetic order of Eu sublattice persists over the whole investigated pressure range up to 14 GPa, yet displaying a non-monotonic variation with pressure. With the increase of the hydrostatic pressure, the magnetic state of Eu in Eu(Fe0.925Co0.075)2As2 evolves from the canted AFM structure in the ground state, via a pure FM structure under the intermediate pressure, finally to an “unconfirmed” AFM structure under the high pressure. The strong ferromagnetism of Eu coexists with the pressure-induced superconductivity around 2 GPa.

W. T. Jin et al., “Hydrostatic pressure effects on the static magnetism in Eu(Fe0.925Co0.075)2As2”, Sci. Rep. 7, 3532 (2017).

Contact: Yixi Su

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