Change of Fermi-surface topology in Bi2Sr2CaCu2O8+o with doping
We report the observation of a change in Fermi-surface topology of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} with doping. By collecting high-statistics angle-resolved photoemission spectroscopy data from moderately and highly overdoped samples and dividing the data by the Fermi function, we answer a long-standing question about the Fermi-surface shape of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} close to the ({pi},0) point. For moderately overdoped samples (T{sub c}=80 K) we find that both the bonding and antibonding sheets of the Fermi surface are hole like, but for a doping level corresponding to T{sub c}=55 K we find that the antibonding sheet becomes electron like. Similar observations of a topology change were observed in La{sub 2-x}Sr{sub x}CuO{sub 4} and in Bi{sub 2}Sr{sub 2}CuO{sub 6+{delta}}. On the other hand, whereas this critical doping value in single-layer materials corresponds to a T{sub c} near zero, it occurs at a smaller doping value in the double-layer case where T{sub c} is still quite high (the difference in doping levels is due to the bilayer splitting). This argues against a van Hove singularity scenario for cuprate superconductivity.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-07CH11358
- OSTI ID:
- 963127
- Report Number(s):
- IS-J 7114; TRN: US0903118
- Journal Information:
- Physical Review B, Vol. 73, Issue 17
- Country of Publication:
- United States
- Language:
- English
Similar Records
Extending Universal Nodal Excitations Optimizes Superconductivity in Bi2Sr2CaCu2O8+delta
Raman and ARPES combined study on the connection between the existence of the pseudogap and the topology of the Fermi surface in