Coexistence of superconductivity and complex 4 f magnetism in Eu0.5Ce0.5BiS2F.

J Phys Condens Matter

Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.

Published: September 2015

EuBiS2F is a self-doped superconductor due to the mixed valence of Eu. Here we report that, with the Ce substitution for Eu by 50 at.%, the material exhibits ferromagnetic ordering at 8 K for the Ce-4 f moment, superconductivity at 2.2 K in the BiS2 layers and possibly antiferromagnetic ordering at 2.1 K for the Eu-4 f spins. The Eu valence is essentially divalent with the Ce incorporation. We tentatively interpret the coexistence of ferromagnetism and superconductivity by considering different Bi-6p orbitals that are responsible for the superconductivity itself and for mediating the ferromagnetic interaction, respectively. We argue that the antiferromagnetic ordering of the Eu-4 f spins is most likely due to a magnetic dipole-dipole interaction.

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Source
http://dx.doi.org/10.1088/0953-8984/27/38/385701DOI Listing

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