A unique coexistence of antiferromagnetism and superconductivity has been observed in zinc-doped CeCoIn5, where antiferromagnetic order emerges continuously from absolute zero within the superconducting phase upon the introduction of zinc ions. Neutron scattering and magnetic susceptibility measurements indicate that the electrons responsible for the antiferromagnetic moments simultaneously contribute to superconducting pairings, suggesting an interplay at the microscopic level. Reflecting this unusual situation, thermodynamic quantity shows no significant indication of the antiferromagnetic phase transition. These distinctive coupling features most likely result in exotic superconducting properties in CeCoIn5.
The article regarding this work:
K. Inoh, R. Koizumi, T. Takahashi, H. Fujimoto, H. Ebisawa, A. Yashiro, M. Kohinata, A. Hosogai, A. Matsuo, K. Kindo, I. Kawasaki, D. Okuyama, H.-C. Wu, T. J. Sato, K. Tenya, K. Ohoyama, K. Iwasa, and M. Yokoyama:
"Continuously evolving antiferromagnetic order within the superconducting
phase in Zn-doped CeCoIn5",
Physical Review B 111, 104510 (2025).
link to this paper