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Laser-excited ultrahigh-resolution photoemission spectroscopy of superconducting Na0.35CoO2·1.3H2O
- Source :
-
Journal of Physics & Chemistry of Solids . Jan2006, Vol. 67 Issue 1-3, p282-285. 4p. - Publication Year :
- 2006
-
Abstract
- Abstract: We have studied the electronic structure near the Fermi level of the layered cobaltate superconductor Na0.35CoO2·1.3H2O using laser-excited ultrahigh-resolution photoemission spectroscopy (PES). In the normal state, we observed the formation of a pseudogap with an energy scale of ∼20meV. Across the superconducting transition, we observed the leading-edge shift at 3.5K compared to that at 10K, indicating superconducting gap (SC gap) opening having a gap value Δ of 0.5–0.7meV. The energy scale of the SC gap is ∼20 times smaller than that of the pseudogap, suggesting the existence of competing order parameters at low temperatures. [Copyright &y& Elsevier]
- Subjects :
- *SUPERCONDUCTORS
*ELECTRON emission
*SPECTRUM analysis
*ELECTRONIC structure
Subjects
Details
- Language :
- English
- ISSN :
- 00223697
- Volume :
- 67
- Issue :
- 1-3
- Database :
- Academic Search Index
- Journal :
- Journal of Physics & Chemistry of Solids
- Publication Type :
- Academic Journal
- Accession number :
- 20262642
- Full Text :
- https://doi.org/10.1016/j.jpcs.2005.10.124