Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn_5

Abstract

Point-contact spectroscopy was performed on single crystals of the heavy-fermion superconductor CeCoIn_5 between 150 mK and 2.5 K. A pulsed measurement technique ensured minimal Joule heating over a wide voltage range. The spectra show Andreev-reflection characteristics with multiple structures which depend on junction impedance. Spectral analysis using the generalized Blonder-Tinkham-Klapwijk formalism for d-wave pairing revealed two coexisting order parameter components, with amplitudes Delta_1 = 0.95 +/- 0.15 meV and Delta_2 = 2.4 +/- 0.3 meV, which evolve differently with temperature. Our observations indicate a highly unconventional pairing mechanism, possibly involving multiple bands.

4 pages, 3 figures

References in corpus (18)

• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Heavy-fermion superconductivity in CeCoIn5 at 2.3K
• Evidence for two superconducting energy gaps in MgB2 by point-contact spectroscopy
• Angular Position of Nodes in the Superconducting Gap of Quasi-2D Heavy-Fermion Superconductor CeCoIn_5
• Unconventional superconductivity in CeIrIn${}_5$ and CeCoIn${}_5$: Specific heat and thermal conductivity studies
• Two-Band Superconductivity in MgB2
• Field-Induced Quantum Critical Point in CeCoIn5
• Superconductivity and Quantum Criticality in CeCoIn_5
• Orbital dependent superconductivity in Sr_2RuO_4
• Spin ordering quantum transitions of superconductors in a magnetic field
• Evidence of a d to s-wave pairing symmetry transition in the electron-doped cuprate superconductor Pr${}_{2-x}$Ce${}_x$CuO${}_4$
• Properties of the superconducting state in a two-band model
• Observation of Andreev Surface Bound States in the 3-K phase Region of Sr_2RuO_4
• The Fermi surface of CeCoIn5: dHvA
• Field-angle Dependence of the Zero-Energy Density of States in the Unconventional Heavy-Fermion Superconductor CeCoIn5
• Magnetically mediated superconductivity: Crossover from cubic to tetragonal lattice
• Spectroscopic evidence for unconventional superconductivity in UBe${}_{13}$
• Anomalous specific heat jump in the heavy fermion superconductor CeCoIn${}_5$

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