Far-infrared properties of ab-plane oriented YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/

Journal Article · Mon Feb 01 04:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.37.1574· OSTI ID:5619810

Bonn, D A; O'Reilly, A H; Greedan, J E; Stager, C V; Timusk, T; Kamaras, K; Tanner, D B

Polycrystalline samples of YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ with a variety of surface treatments show differences in absolute reflectance and width of phonon lines. Samples that are not polished and are measured immediately after annealing have largely grains with the c axis normal to the surface. Such oriented samples show a gaplike depression of conductivity in the far infrared that sets in below the superconducting transition temperature but no true gap. Phonon lines at 195 cm/sup -1/ and at 155 cm/sup -1/ narrow in the superconducting state, in analogy with the effect of the electron-phonon interaction in Bardeen-Cooper-Schrieffer superconductors. In the normal state the background conductivity is Drudelike with a plasma frequency of 0.75 eV and a relaxation rate of 200 cm/sup -1/. The extrapolated far-infrared conductivity agrees with the measured dc conductivity.

• Research Organization: Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8Schemically bond4M1
• OSTI ID: 5619810
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 37:4; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTROMAGNETIC RADIATION
ENERGY GAP
FAR INFRARED RADIATION
HEAT TREATMENTS
INFRARED RADIATION
OPTICAL PROPERTIES
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHONONS
PHYSICAL PROPERTIES
POLYCRYSTALS
QUASI PARTICLES
RADIATIONS
REFLECTIVITY
SUPERCONDUCTORS
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES