Enhancing the Superconducting Transition Temperature of CeRh1−xIrxIn5 due to the Strong-Coupling Effects of Antiferromagnetic Spin Fluctuations: An In115 Nuclear Quadrupole Resonance Study
Shinji Kawasaki, Mitsuharu Yashima, Yoichi Mugino, Hidekazu Mukuda, Yoshio Kitaoka, Hiroaki Shishido, Yoshichika Ōnuki
DOI 10.1103/PhysRevLett.96.147001 · Physical Review Letters
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Abstract
We report on systematic evolutions of antiferromagnetic (AFM) spin fluctuations and unconventional superconductivity (SC) in heavy-fermion (HF) compounds CeRh1−xIrxIn5 via an In115 nuclear-quadrupole-resonance experiment. The nuclear spin-lattice relaxation rate 1/T1 has revealed the marked development of AFM spin fluctuations as approaching an AFM ordered state. Concomitantly, the superconducting transition temperature Tc and the energy gap Δ0 increase drastically from Tc=0.4 K and 2Δ0/kBTc=5 in CeIrIn5 up to Tc=1.2 K and 2Δ0/kBTc=8.3 in CeRh0.3Ir0.7In5, respectively. The present work suggests that the AFM spin fluctuations in close proximity to the AFM quantum critical point are indeed responsible for the strong-coupling unconventional SC in HF compounds.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeIrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.4 | Pressure not reported | onset |
| CeRh0.3Ir0.7In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | onset |
| CeRh0.5Ir0.5In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | onset |
| CeIrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | 3 GPa | onset |
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