Pressure-induced anomalous magnetism and unconventional superconductivity in CeRhIn5: 115In-NQR study under pressure
T. Mito, S. Kawasaki, G.-q. Zheng, Y. Kawasaki, K. Ishida, Y. Kitaoka, D. Aoki, Y. Haga, Y. Onuki
DOI 10.1103/PhysRevB.63.220507 · Physical Review B
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Abstract
We report 115In nuclear-quadrupole-resonance (NQR) measurements of the pressure (P)-induced superconductor CeRhIn5 in the antiferromagnetic (AF) and superconducting (SC) states. In the AF region, the internal field Hint at the In site is substantially reduced from Hint=1.75kOe at P=0 to 0.39 kOe at P=1.23GPa, while the Néel temperature slightly changes with increasing P. This suggests that either the size in the ordered moment MQ(P) or the angle θ(P) between the direction of MQ(P) and the tetragonal c axis is extrapolated to zero at P*=1.6±0.1GPa at which a bulk SC transition is no longer emergent. In the SC state at P=2.1GPa, the nuclear spin-lattice relaxation rate 115(1/T1) has revealed a T3 dependence without the coherence peak just below Tc, giving evidence for the unconventional superconductivity. The dimensionality of the magnetic fluctuations in the normal state is also discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeRhIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.1 | 1.8 GPa | onset |
| CeRhIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | 2.15 GPa | onset |
| CeRhIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | 2.1 GPa | unknown |
| CeCu2Ge2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CePd2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CeIn3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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