# BSCCO superconductors : hole-like fermi surface and doping dependence of the gap function.

## Abstract

We use the gradient of the energy-integrated angle resolved photoemission (ARPES) intensity in order to define precisely the Fermi surface (FS) in BSCCO superconductors. We show that, independent of the photon energy, the FS is a hole barrel centered at ({pi},{pi}), Then, the superconducting gap along the FS is precisely determined from ARPES measurements on over-doped and underdoped samples of Bi2212. As the doping decreases, the maximum gap increases, but the slope of the gap near the nodes decreases. Though consistent with d-wave symmetry, the gap with underdoping cannot be fit by the simple cos(k{sub x})-cos(k{sub y}) form. A comparison of our ARPES results with available penetration depth data indicates that the renormalization of the linear T suppression of the superfluid density at low temperatures due to quasiparticle excitations around the d-wave nodes is large and doping dependent.

- Authors:

- Publication Date:

- Research Org.:
- Argonne National Lab., IL (US)

- Sponsoring Org.:
- US Department of Energy (US)

- OSTI Identifier:
- 11940

- Report Number(s):
- ANL/MSD/CP-99834

TRN: AH200119%%135

- DOE Contract Number:
- W-31109-ENG-38

- Resource Type:
- Conference

- Resource Relation:
- Conference: Physics and Chemistry of Molecular and Oxide Superconductors International Conference, Stockholm (SE), 07/28/1999--08/02/1999; Other Information: PBD: 18 Aug 1999

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 36 MATERIALS SCIENCE; FERMI LEVEL; PENETRATION DEPTH; PHOTOEMISSION; HIGH-TC SUPERCONDUCTORS; BISMUTH OXIDES; STRONTIUM OXIDES; CALCIUM OXIDES; COPPER OXIDES; ENERGY GAP

### Citation Formats

```
Campuzano, J. C., Ding, H., Fretwell, H. M., Kadowaki, K., Kaminski, A., Mesot, J., Mochiku, T., Norman, M. R., Paramekanti, A., Randeria, M., Sato, T., Takahashi, T., Takeuchi, T., and Yokoya, T.
```*BSCCO superconductors : hole-like fermi surface and doping dependence of the gap function.*. United States: N. p., 1999.
Web.

```
Campuzano, J. C., Ding, H., Fretwell, H. M., Kadowaki, K., Kaminski, A., Mesot, J., Mochiku, T., Norman, M. R., Paramekanti, A., Randeria, M., Sato, T., Takahashi, T., Takeuchi, T., & Yokoya, T.
```*BSCCO superconductors : hole-like fermi surface and doping dependence of the gap function.*. United States.

```
Campuzano, J. C., Ding, H., Fretwell, H. M., Kadowaki, K., Kaminski, A., Mesot, J., Mochiku, T., Norman, M. R., Paramekanti, A., Randeria, M., Sato, T., Takahashi, T., Takeuchi, T., and Yokoya, T. Wed .
"BSCCO superconductors : hole-like fermi surface and doping dependence of the gap function.". United States. https://www.osti.gov/servlets/purl/11940.
```

```
@article{osti_11940,
```

title = {BSCCO superconductors : hole-like fermi surface and doping dependence of the gap function.},

author = {Campuzano, J. C. and Ding, H. and Fretwell, H. M. and Kadowaki, K. and Kaminski, A. and Mesot, J. and Mochiku, T. and Norman, M. R. and Paramekanti, A. and Randeria, M. and Sato, T. and Takahashi, T. and Takeuchi, T. and Yokoya, T.},

abstractNote = {We use the gradient of the energy-integrated angle resolved photoemission (ARPES) intensity in order to define precisely the Fermi surface (FS) in BSCCO superconductors. We show that, independent of the photon energy, the FS is a hole barrel centered at ({pi},{pi}), Then, the superconducting gap along the FS is precisely determined from ARPES measurements on over-doped and underdoped samples of Bi2212. As the doping decreases, the maximum gap increases, but the slope of the gap near the nodes decreases. Though consistent with d-wave symmetry, the gap with underdoping cannot be fit by the simple cos(k{sub x})-cos(k{sub y}) form. A comparison of our ARPES results with available penetration depth data indicates that the renormalization of the linear T suppression of the superfluid density at low temperatures due to quasiparticle excitations around the d-wave nodes is large and doping dependent.},

doi = {},

journal = {},

number = ,

volume = ,

place = {United States},

year = {1999},

month = {8}

}