Possibility of Valence-Fluctuatsion-Mediated Superconductivity in Cd-Doped CeIrIn5 Probed by In NQR
M. Yashima, N. Tagami, S. Taniguchi, T. Unemori, K. Uematsu, H. Mukuda, Y. Kitaoka, Y. Ōta, F. Honda, R. Settai, Y. Ōnuki
DOI 10.1103/PhysRevLett.109.117001 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report on a pressure-induced evolution of exotic superconductivity and spin correlations in CeIr(In1−xCdx)5 by means of in-nuclear-quadrupole-resonance (NQR) studies. Measurements of an NQR spectrum and nuclear-spin-lattice-relaxation rate 1/T1 have revealed that antiferromagnetism induced by Cd doping emerges locally around Cd dopants, but superconductivity is suddenly induced at Tc=0.7 and 0.9 K at 2.34 and 2.75 GPa, respectively. The unique superconducting characteristics with a large fraction of the residual density of state at the Fermi level which increases with Tc differ from those for anisotropic superconductivity mediated by antiferromagnetic correlations. By incorporating the pressure dependence of the NQR frequency pointing to the valence change of Ce, we suggest that unconventional superconductivity in the CeIr(In1−xCdx)5 system may be mediated by valence fluctuations.
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 unresolved | unknown |
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure unresolved | unknown |
| 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 |
| CeIr(In1-xCdx)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.7 | 2.34 GPa | unknown |
| CeIr(In1-xCdx)5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.9 | 2.75 GPa | unknown |
Similar papers
Precursor state to superconductivity in CeIrIn5: Unusual scaling of magnetotransport
similarity 0.94Sunil Nair et al.
Source status unknown — claims are unverified
Multiband Superconductivity with Unexpected Deficiency of Nodal Quasiparticles in CeCu2Si2
similarity 0.94Shunichiro Kittaka et al.
Source status unknown — claims are unverified
Quantum criticality linked to the suppressed superconducting upper critical field in Ni-doped CeCoIn5
similarity 0.94Azumi Yashiro et al.
Source status unknown — claims are unverified
Spin fluctuations and superconductivity in layered f-electron superlattices
similarity 0.94Yasuhiro Tada & Robert Peters
Source status unknown — claims are unverified
Vortexlike excitations in the heavy-fermion superconductor CeIrIn5
similarity 0.94Yongkang Luo et al.
Source status unknown — claims are unverified
Magnetic-Field-Induced Enhancements of Nuclear Spin-Lattice Relaxation Rates in the Heavy-Fermion Superconductor CeCoIn5 Using Co59 Nuclear Magnetic Resonance
similarity 0.94H. Sakai et al.
Source status unknown — claims are unverified