Spatial separation of antiferromagnetism and superconductivity in CeCu2Si2

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Abstract

Depending on the actual stoichiometry, CeCu2Si2 shows either antiferromagnetic order, superconductivity or both phenomena. We investigated a single crystal, where TcTN=0.7K are roughly degenerate. A custom-made in-situ AC-susceptibility setup was utilized for an elastic neutron scattering experiment to directly correlate antiferromagnetic intensity and AC-susceptibility. We found antiferromagnetic satellite peaks together with a diamagnetic signal below TN. The results can be understood by a temperature and magnetic field dependent spatial separation of antiferromagnetic and superconducting volume fractions.

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Acknowledgments

We greatly acknowledge the help of J.L. Raggazzoni concerning all cryogenic equipment. The work was supported by the DFG within the scope of SFB 463.

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