Electron tunneling spectroscopy of single-crystal Bi2Sr2CaCu2O8
Creators
- 1. Polytechnic University, Brooklyn, New York 11201 (United States)
Description
The T-dependent conductance G(V,T) of evaporated Pb junctions on cleaved ab planes of Bi2Sr2CaCu2O8 (2:2:1:2) crystals is presented. Strong superconducting Gs(V,T) structures imply a large gap, approximately Δ0(0)=26 meV, or 2Δ0(0)/kBTc=6.7. An analysis of G(V,T) near Tc, assuming a lifetime-broadened BCS Ns(E), reveals a broadening Γ(T) such that Δ(Tc)∼Γ(Tc)∼2kBTc. The fitted Δ(Tc), unlike typical BCS values, is ∼0.8Δ(0). $G(V,T>T sub c )--- has a minimum at V=0, suggestive of known c-direction localization in 2:2:1:2 compounds. G(V,T) also reveals the expected fluctuation superconductivity above Tc. 4.2-K scanning-tunneling-microscope (STM) spectra are mentioned in comparison. A larger gap, about 40 meV, and dip at 80 meV, found in the STM G(V) are tentatively attributed to CuO2 planes
Additional details
Publishing Information
- Journal Title
- Physical Review. B, Condensed Matter
- Journal Volume
- 45
- Journal Issue
- 18
- Journal Page Range
- p. 10622-10632.
- ISSN
- 0163-1829
- CODEN
- PRBMDO
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 24000581
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- BCS THEORY; BISMUTH OXIDES; CALCIUM OXIDES; COPPER OXIDES; ENERGY GAP; HIGH-TC SUPERCONDUCTORS; MONOCRYSTALS; STRONTIUM OXIDES; TEMPERATURE DEPENDENCE; TRANSITION TEMPERATURE
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; CRYSTALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS