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Abstract
The Cooper pairing mechanism of heavy fermion superconductors(14), long thought to be due to spin fluctuations(57), has not yet been determined. It is the momentum space (kspace) structure of the superconducting energy gap Delta(k) that encodes specifics of this pairing mechanism. However, because the energy scales are so low, it has not been possible to directly measure Delta(k) for any heavy fermion superconductor. Bogoliubov quasiparticle interference imaging(8), a proven technique for measuring the energy gaps of superconductors with high critical temperatures(911), has recently been proposed(12) as a new method to measure Delta(k) in heavy fermion superconductors, specifically CeCoIn5 (ref. 13). By implementing this method, we detect a superconducting energy gap whose nodes are oriented along k parallel to (+/ 1; +/ 1)pi/a(0) directions(1417). Moreover, for the first time in any heavy fermion superconductor, we determine the detailed structure of its multiband energy gaps Delta(i)(k). For CeCoIn5, this information includes: the complex band structure and Fermi surface of the hybridized heavy bands, the fact that largest magnitude Delta(k) opens on a highk band so that the primary gap nodes occur at unforeseen kspace locations, and that the Bogoliubov quasiparticle interference patterns are most consistent with d(x2y2) gap symmetry. Such quantitative knowledge of both the heavy bandstructure and superconducting gapstructure will be critical in identifying the microscopic pairing mechanism of heavy fermion superconductivity.
Original language  English 

Pages (fromto)  468473 
Number of pages  6 
Journal  Nature Physics 
Volume  9 
Issue number  8 
DOIs  
Publication status  Published  Aug 2013 
Keywords
 QUASIPARTICLE INTERFERENCE
 SUPERCONDUCTIVITY
 CEIRIN5
 LATTICE
 ORDER
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Dive into the research topics of 'Imaging Cooper pairing of heavy fermions in CeCoIn_{5}'. Together they form a unique fingerprint.Projects
 1 Finished

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems
Wahl, P. (PI), Baumberger, F. (CoI), Davis, J. C. (CoI), Green, A. (CoI), Hooley, C. (CoI), Keeling, J. M. J. (CoI) & Mackenzie, A. (CoI)
1/09/11 → 31/08/17
Project: Standard