Coexistence of superconductivity and complex 4$f$ magnetism in Eu$_{0.5}$Ce$_{0.5}$BiS$_{2}$F
| Autor: | Zhai, Hui-Fei, Zhang, Pan, Tang, Zhang-Tu, Bao, Jin-Ke, Jiang, Hao, Feng, Chun-Mu, Xu, Zhu-An, Cao, Guang-Han |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | J. Phys.: Condens. Matter 27, 385701 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0953-8984/27/38/385701 |
| Popis: | EuBiS$_{2}$F 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 BiS$_2$ 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-6$p$ orbitals that are responsible for 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. Comment: 12 pages, 5 figures |
| Databáze: | arXiv |
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