Distinct Pairing Symmetries in Nd1.85Ce0.15CuO4-δ and La1.89Sr0.11CuO4 Single Crystals: Evidence from Comparative Tunneling Measurements
- Chinese Academy of Sciences
- University of Tennessee, Knoxville (UTK)
- ORNL
We used point-contact tunneling spectroscopy to study the superconducting pairing symmetry of electron-doped Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4-y} (NCCO) and hole-doped La{sub 1.89}Sr{sub 0.11}CuO{sub 4} (LSCO). Nearly identical spectra without zero bias conductance peak (ZBCP) were obtained on the (110) and (100) oriented surfaces (the so-called nodal and anti-nodal directions) of NCCO. In contrast, LSCO showed a remarkable ZBCP in the nodal direction as expected from a d-wave superconductor. Detailed analysis reveals an s-wave component in the pairing symmetry of the NCCO sample with {Delta}?k{sub B}T{sub c}=1.66, a value remarkably close to that of a weakly coupled Bardeen-Cooper-Schriffer (BCS) superconductor. We argue that this s-wave component is formed at the Fermi surface pockets centered at ({+-}{pi},0) and (0,{+-}{pi}) although a d-wave component may also exist.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1003231
- Journal Information:
- Physical Review B, Vol. 72, Issue 14; ISSN 1098--0121
- Country of Publication:
- United States
- Language:
- English
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