Spectroscopic Evidence for Multiple Order Parameter Components in the Heavy Fermion Superconductor CeCoIn_5
P. M. C. Rourke (1), M. A. Tanatar (1), C. S. Turel (1), J. Berdeklis, (1), C. Petrovic (2), and J. Y. T. Wei (1) ((1) University of Toronto,, Canada, (2) Brookhaven National Laboratory, USA)
TL;DR
This study provides spectroscopic evidence for multiple coexisting order parameter components in the heavy-fermion superconductor CeCoIn_5, suggesting an unconventional pairing mechanism involving multiple bands.
Contribution
The paper reports the first direct spectroscopic detection of multiple order parameters in CeCoIn_5 using point-contact spectroscopy and advanced spectral analysis.
Findings
Identification of two coexisting order parameters with distinct amplitudes.
Spectral features depend on junction impedance and evolve differently with temperature.
Evidence supporting a highly unconventional, multi-band pairing mechanism.
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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.