Photoinduced self-localized polarons in Tl sub 2 Ba sub 2 Ca sub 1-x Gd sub x Cu sub 2 O sub 8 : A proposal for van der walls pairing. Technical report

Technical Report · Sun Jan 01 00:00:00 EST 1989

OSTI ID:6881099

Foster, C M; Heeger, A J; Stucky, G

Studies of photoinjected carriers at dilute concentrations in the semiconducting parent compounds of the high temperature superconducting oxides offer the promise of insight into the nature of the carriers and their interaction with the lattice. Photoinduced absorption measurements are reported for the infrared spectral range from 130 to 5000/cm. The observation of infrared activity vibrational (IRAV) modes and an associated electronic transition (at 0.095 eV) with common intensity and temperature dependence indicate the formation of self-localized polarons. Both the dynamic mass (Md) and the gap state energy (h(Omega el)) are smaller than in either YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} or La{sub 2}CuO{sub 4}. For all three systems, Md and Omega el are correlated with T(c) of the superconducting phase. Reprints.

• Research Organization: California Univ., Santa Barbara, CA (USA). Dept. of Physics
• OSTI ID: 6881099
• Report Number(s): AD-A-219078/3/XAB; TR--40
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHARGE CARRIERS
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DOCUMENT TYPES
DYNAMICS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY GAP
ENERGY-LEVEL TRANSITIONS
FERMIONS
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HIGH TEMPERATURE
HIGH-TC SUPERCONDUCTORS
INFRARED RADIATION
INFRARED SPECTRA
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LEPTONS
MASS
MATERIALS
MECHANICS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLARIZATION
POLARONS
PROGRESS REPORT
QUANTITY RATIO
QUASI PARTICLES
RADIATIONS
RARE EARTH COMPOUNDS
SEMICONDUCTOR MATERIALS
SPECTRA
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VAN DER WAALS FORCES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES