Quantum criticality linked to the suppressed superconducting upper critical field in Ni-doped CeCoIn5
Azumi Yashiro, Rahmanto, Kaketo Inami, Kohei Suzuki, Kaede Inoh, Teppei Takahashi, Ryosuke Koizumi, Yohei Kono, Shunichiro Kittaka, Yusei Shimizu, Fuminori Honda, Dai Aoki, Kenichi Tenya, Makoto Yokoyama
DOI 10.1103/PhysRevMaterials.8.L081801 · Physical Review Materials
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Abstract
We demonstrate a close connection between the quantum critical point (QCP) and superconducting upper critical field Hc2 in the Ni-doped heavy-fermion superconductor CeCoIn5. Temperature variations of electrical resistivity ρ(T) exhibit a crossover between the non-Fermi liquid and the Fermi liquid states, whose boundary for T→0, regarded as the QCP, coincides with Hc2, while Hc2 decreases to zero with increasing Ni concentrations up to 25%. Furthermore, the A coefficient of the T2 term in ρ(T) estimated in the Fermi liquid region shows the diverging behavior with decreasing the magnetic field H toward Hc2. These experimental results suggest that the emergence of the QCP is always accompanied by the breakdown of the superconducting state by H in Ni-doped CeCoIn5.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure not reported | unknown |
| CeCo1-xNixIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.4 | Pressure not reported | onset |
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