Published September 2, 1991 | Version v1
Journal article Metadata-only

Pair momentum distribution in Bi2Sr2CaCu2O8+δ measured by positron annihilation: Existence and nature of the Fermi surface

Creators

  • 1. Brookhaven National Laboratory, Upton, New York (USA)
  • 2. AT ampersand T Bell Laboratories, Murray Hill, New Jersey (USA)
  • 3. Brookhaven National Laboratory, Upton, New York, (USA)
  • 4. Institut Romand de Recherche Numerique en Physique des Materiaux (IRRMA), PHB Ecublens, CH-105 Lausanne (Switzerland)
  • 5. Department of Physics, Stanford University, Stanford, California (USA)

Description

We report the first measurement of the positron-electron momentum density in superconducting single-crystal Bi2Sr2CaCu2O8+δ (Tc∼90 K). The observed anisotropy exhibits a twofold (rather than fourfold) symmetry, which is attributed to the superlattice modulation along the b axis of the BiO2 layers. Subtraction of the superlattice contribution also reveals a pair momentum distribution consistent with the CuO2 and BiO2 Fermi surfaces, and in reasonable agreement with the theoretical pair momentum density derived from band theory

Additional details

Publishing Information

Journal Title
Physical Review Letters
Journal Volume
67
Journal Issue
10
Series
Phys. Rev. Lett.
Journal Page Range
1350-1353
ISSN
0031-9007
CODEN
PRLTA

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
23004590
Subject category
S36: MATERIALS SCIENCE; S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
ANNIHILATION; BAND THEORY; BISMUTH OXIDES; CALCIUM OXIDES; CUPRATES; FERMI LEVEL; HIGH-TC SUPERCONDUCTORS; MONOCRYSTALS; POSITRON BEAMS; STRONTIUM OXIDES
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; BEAMS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; CRYSTALS; ENERGY LEVELS; INTERACTIONS; LEPTON BEAMS; OXIDES; OXYGEN COMPOUNDS; PARTICLE BEAMS; PARTICLE INTERACTIONS; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS