Enhancing the Superconducting Transition Temperature due to Strong-Coupling Effect under Antiferromagnetic Spin Fluctuations in CeRh1-xIrxIn5 : 115In-NQR Study

Abstract

We report on systematic evolutions of antiferromagnetic (AFM) spin fluctuations and unconventional superconductivity (SC) in heavy-fermion (HF) compounds CeRh${}_{1-x}$Ir${}_x$In${}_5$ via ${}^{115}$In nuclear-quadrupole-resonance (NQR) experiment. The measurements of nuclear spin-lattice relaxation rate $1/T_1$ have revealed the marked development of AFM spin fluctuations as a consequence of approaching an AFM ordered state with increasing Rh content. Concomitantly the superconducting transition temperature $T_{\mathrm{c}}$ and the energy gap ${\Delta }_0$ increase drastically from $T_{\mathrm{c}}=0.4$ K and $2{\Delta }_0/k_{\mathrm{B}}{T}_{\mathrm{c}}=5$ in CeIrIn${}_5$ up to $T_{\mathrm{c}}=1.2$ K and $2{\Delta }_0/k_{\mathrm{B}}{T}_{\mathrm{c}}=8.3$ in CeRh${}_{0.3}$Ir${}_{0.7}$In${}_5$, respectively. The present work suggests that the AFM spin fluctuations in close proximity to the AFM quantum critical point are indeed responsible for the onset of strong-coupling unconventional SC with the line node in the gap function in HF compounds.

4pages,5figures,to appear in Phys. Rev. Lett

References in corpus (12)

• Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor CeCoIn_5
• Enhanced Valence Fluctuations Caused by f-c Coulomb Interaction in Ce-Based Heavy Electrons: Possible Origin of Pressure-Induced Enhancement of Superconducting Transition Temperature in \Ge and Related Compounds
• Coexistence of magnetism and superconductivity in CeRh1-xIrxIn5
• Unique Spin Dynamics and Unconventional Superconductivity in the Layered Heavy Fermion Compound CeIrIn_5:NQR Evidence
• Gapless Magnetic and Quasiparticle Excitations due to the Coexistence of Antiferromagnetism and Superconductivity in CeRhIn${}_5$ : A study of ${}^{115}$In-NQR under Pressure
• Superconductivity on the threshold of magnetism in CePd2Si2 and CeIn3
• Huge Enhancement of Impurity Scattering due to Critical Valence Fluctuations in a Ce-Based Heavy Electron System
• Pressure-Temperature Phase Diagram of Antiferromagnetism and Superconductivity in CeRhIn5 and CeIn3 : In-NQR Study under Pressure
• Anisotropic spin fluctuations in heavy-fermion superconductor CeCoIn5: In-NQR and Co-NMR studies
• Two Superconducting Phases in CeRh_1-xIr_xIn_5
• Coexistence of antiferromagnetic order and unconventional superconductivity in heavy fermion compounds CeRh_{1-x}Ir_xIn_5: nuclear quadrupole resonance studies
• Enhancing the Superconducting Transition Temperature in the Absence of Spin Correlations in Heavy Fermion Compound CeIrIn${}_5$

Cited by in corpus (22)

• Superconducting phases of f-electron compounds
• (pi,pi)-electronic order in iron arsenide superconductors
• Multiple quantum phase transitions and superconductivity in Ce-based heavy fermions
• Thermal conductivity evidence for d_{x^2-y^2} pairing symmetry in the heavy-fermion CeIrIn5 superconductor
• Tandem Pairing in Heavy Fermion Superconductors
• Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3: An 115In-NQR study under pressure
• Competition between unconventional superconductivity and incommensurate antiferromagnetic order in CeRh1-xCoxIn5
• High-field phase-diagram of Fe arsenide superconductors
• Magneto-transport properties governed by the antiferromagnetic fluctuations in heavy fermion superconductor CeIrIn${}_5$
• New Magnetic State in Incommensurate Magnetic Phase of Heavy-Fermion Superconductor CeRh0.6Co0.4In5
• Pressure-induced unconventional superconductivity near a quantum critical point in CaFe2As2
• CeIrIn5: Superconductivity on a Magnetic Instability
• Anisotropic Dependence of Superconductivity on Uniaxial Pressure in CeIrIn5
• Field-angle-resolved anisotropy in superconducting CeCoIn5 using realistic Fermi surfaces
• Superconducting gap structure of CeIrIn5 from field-angle-resolved measurements of its specific heat
• Heat-Capacity Measurements of Energy-Gap Nodes of the Heavy-Fermion Superconductor CeIrIn5 Deep inside the Pressure-Dependent Dome Structure of its Superconducting Phase Diagram
• Possibility of valence-fluctuation mediated superconductivity in Cd-doped CeIrIn${}_5$ probed by In-NQR
• Multiple superconducting phases in heavy-fermion metals
• Coherence Temperature in the Diluted Periodic Anderson Model
• Hyperfine Couplings as a Probe of Orbital Anisotropy in Heavy Fermion Materials
• Universal relationship between low-energy antiferromagnetic fluctuations and superconductivity in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Navigating the trends in the proximity to magnetic quantum critical point and superconductivity for Ce-based heavy-fermion compounds