Journal
NATURE PHYSICS
Volume 9, Issue 8, Pages 474-479Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS2672
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Funding
- DOE-BES
- Princeton Nanoscale Microscopy Laboratory [NSF-DMR1104612]
- NSF-MRSEC program through Princeton Center for Complex Materials [DMR-0819860]
- Linda and Eric Schmidt Transformative Fund
- W. M. Keck Foundation
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering
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Understanding the origin of superconductivity in strongly correlated electron systems continues to be at the forefront of the unsolved problems of physics(1). Among the heavy f-electron systems, CeCoIn5 is one of the most fascinating, as it shares many of the characteristics of correlated d-electron high-T-c cuprate and pnictide superconductors(2-4), including competition between antiferromagnetism and superconductivity(5). Although there has been evidence for unconventional pairing in this compound(6-11), high-resolution spectroscopic measurements of the superconducting state have been lacking. Previously, we have used high-resolution scanning tunnelling microscopy (STM) techniques to visualize the emergence of heavy fermion excitations in CeCoIn5 and demonstrate the composite nature of these excitations well above T-c (ref. 12). Here we extend these techniques to much lower temperatures to investigate how superconductivity develops within a strongly correlated band of composite excitations. We find the spectrum of heavy excitations to be strongly modified just before the onset of superconductivity by a suppression of the spectral weight near the Fermi energy (E-F), reminiscent of the pseudogap state(13,14) in the cuprates. By measuring the response of superconductivity to various perturbations, through both quasiparticle interference (QPI) and local pair-breaking experiments, we demonstrate the nodal d-wave character of superconducting pairing in CeCoIn5.
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