Particle–Hole Asymmetry and the Pseudogap Phase of the High-TC Superconductors
In the pseudogap phase of the copper oxide superconductors, a significant portion of the Fermi surface is still gapped at temperatures above the superconducting transition temperature T{sub C}. Instead of a closed Fermi surface, the low-energy electronic excitations appear to form unconnected Fermi arcs separated by gapped regions. It is generally believed that the spectral function is particle-hole symmetric (at low energies) in both regions - with a peak at the Fermi level on the Fermi arcs and a local minimum at the Fermi level in the gapped regions. Here, using high resolution angle-resolved photoemission and new techniques of analysis, we show that on a sizable portion of the Fermi surface, the electronic structure in the immediate vicinity of the Fermi level is not particle-hole symmetric in the pseudogap phase. This is clear evidence that an alternative ground state competes with the superconductivity. The observations are also consistent with the possibility that the Fermi arcs are, in fact, the inner surface of the predicted Fermi pockets.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 984807
- Report Number(s):
- BNL-93795-2010-JA; R&D Project: PO-016; KC0202020; TRN: US1006036
- Journal Information:
- Journal of Superconductivity and Novel Magnetism, Vol. 23, Issue 5; ISSN 1557-1939
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ASYMMETRY
COPPER OXIDES
ELECTRONIC STRUCTURE
FERMI LEVEL
GROUND STATES
PHOTOEMISSION
RESOLUTION
SPECTRAL FUNCTIONS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION TEMPERATURE
High-T C superconductor
Angle-resolved photoemission spectroscopy
Pseudogap phase
Particle–hole asymmetry
Fermi surface