Thermal conductivity evidence for d_{x^2-y^2} pairing symmetry in the heavy-fermion CeIrIn5 superconductor

Abstract

Quasi-two dimensional CeIrIn5 contains two distinct domes with different heavy fermion superconducting states in its phase diagram. Here we pinned down the superconducting gap structure of CeIrIn5 in the second dome, located away from the antiferromagnetic quantum critical point, by the thermal transport measurements in magnetic fields rotated relative to the crystal axes. Clear fourfold oscillation was observed when the field is rotated within the ab-plane, while no oscillation was observed within the bc-plane. In sharp contrast to previous reports, our results are most consistent with d_{x^2-y^2} symmetry, implying that two superconducting phases have the same gap symmetry which appears to be mediated by antiferromagnetic spin fluctuations.

5 pages, 4 figures

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• d-wave superconductivity in the frustrated two-dimensional periodic Anderson model
• Inversion of specific heat oscillations with in-plane magnetic field angle in 2D d-wave superconductors
• Possibility of valence-fluctuation mediated superconductivity in Cd-doped CeIrIn${}_5$ probed by In-NQR
• The precursor state to superconductivity in CeIrIn${}_5$: Unusual scaling of magnetotransport
• Non-linear effect of uniaxial pressure on superconductivity in CeCoIn5
• Increase in d-Wave Superconducting Transition Temperature near Imperfect Layer in Correlated Electron System
• Sub-Phases in the Superconducting State of CeIrIn${}_5$ Revealed by Low Temperature $c$-axis Heat Transport
• Universal heat transport in a heavy-fermion superconductor