CeIrIn5: Superconductivity on a Magnetic Instability

Abstract

We report the doping-induced antiferromagnetic state and Fermi liquid state that are connected by a superconducting region in a series of CeIrIn${}_{5-x}$Hg${}_x$, CeIrIn${}_{5-x}$Sn${}_x$ and CeIr${}_{1-x}$Pt${}_x$In${}_5$ single crystals. Measurements of the specific heat $C(T)$ and electrical resistivity $\rho (T)$ demonstrate that hole doping via Hg/In substitution gives rise to an antiferromagnetic ground state, but substitutions of In by Sn or Ir by Pt (electron doping) favor a paramagnetic Fermi liquid state. A cone-like non-Fermi liquid region is observed near CeIrIn${}_5$, showing a diverging effective mass on the slightly Hg-doped side. The obtained temperature-doping phase diagram suggests that CeIrIn${}_5$ is in proximity to an antiferromagnetic quantum critical point, and heavy fermion superconductivity in this compound is mediated by magnetic quantum fluctuations rather than by valence fluctuations.

5pages, 5figures

References in corpus (10)

• Hidden Magnetism and Quantum Criticality in the Heavy Fermion Superconductor CeRhIn5
• Signatures of valence fluctuations in CeCu2Si2 under high pressure
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• Towards the identification of a quantum critical line in the (p, B) phase diagram of CeCoIn5
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Cited by in corpus (12)

• Unconventional Superconductivity
• Multiple quantum phase transitions and superconductivity in Ce-based heavy fermions
• Spatially modulated heavy-fermion superconductivity in CeIrIn5
• d-wave superconductivity in the frustrated two-dimensional periodic Anderson model
• Two types of superconducting domes in unconventional superconductors
• Multiple superconducting phases in heavy-fermion metals
• Anisotropic magnetotransport and magnetic phase diagrams of the antiferromagnetic heavy-fermion superconductor Ce${}_3$PdIn${}_{11}$
• Vortexlike excitations in the heavy-fermion superconductor CeIrIn${}_5$
• Phase evolution of Ce-based heavy-fermion superconductors under compression: a combined first-principle and effective-model study
• Heat transport study of field-tuned quantum criticality in CeIrIn5
• Spatial modulation of a unitary impurity-induced resonances in superconducting CeCoIn${}_5$
• Sub-Phases in the Superconducting State of CeIrIn${}_5$ Revealed by Low Temperature $c$-axis Heat Transport