Controlling carrier density in strongly correlated superconductors is a longstanding challenge in condensed-matter physics. Hall-effect measurements on the heavy-fermion superconductor CeCo1-xNixIn5 reveal that Ni substitution continuously increases the electron carrier density while separating two distinct anomalous transport responses emerging near unconventional superconductivity, potentially linked to anomalous superconducting properties. Their markedly different doping evolutions point to separate underlying mechanisms. The results demonstrate that controlled carrier-density tuning can disentangle multiple anomalous transport states in CeCoIn5, providing a new route for investigating quantum-critical superconductivity.
The article regarding this work:
R. Koizumi, H. Fujimoto, T. Takahashi, A. Yashiro, H. Kawakami, K. Ishii, H. Kosaka, T. Hasegawa, Y. Shimizu, A. Nakamura, D. Aoki, K. Tenya, and M. Yokoyama:
"Carrier-doping effect and anomalous transport properties in Ni-doped CeCoIn5 investigated by Hall resistivity measurements",
Physical Review B 113, 224514-1-10 (2026).
link to this paper