Application of the polaron-transport theory to. sigma. (. omega. ) in Tl sub 2 Ba sub 2 Ca sub 1 minus x Gd sub x Cu sub 2 O sub 8 , YBa sub 2 Cu sub 3 O sub 7 minus. delta. , and La sub 2 minus x Sr sub x CuO sub 4

Journal Article · Thu Nov 01 00:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

OSTI ID:5999962

Mihailovic, D; Foster, C M; Voss, K; Heeger, A J ^[1]

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1. Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara, CA (USA) Department of Physics, University of California,Santa Barbara, Santa Barbara, CA (USA)

We analyze the frequency-dependent photoinduced infrared conductivity, {sigma}{sub {ital P}}({omega}), obtained from photoinduced absorption measurements of the insulators Tl{sub 2}Ba{sub 2}Ca{sub 0.98}Gd{sub 0.02}Cu{sub 2}O{sub 8}, YBa{sub 2}Cu{sub 3}O{sub 6.3}, and La{sub 2}CuO{sub 4} in terms of {sigma}{sub PT}({omega}) calculated from nonadiabatic polaron-transport theory. The calculated {sigma}{sub PT}({omega}) is in good agreement with the experimental {sigma}{sub {ital P}}({omega}) in the midinfrared. We also compare {sigma}{sub {ital P}}({omega}) with the infrared conductivity, {sigma}({omega}), of the high-{Tc} superconductors Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8}, YBa{sub 2}Cu{sub 3}O{sub 7}, and La{sub 1.85}Sr{sub 0.15}CuO{sub 4}. The similar spectral shape and systematic trends in both {sigma}{sub {ital P}}({omega}) and {sigma}({omega}) indicate that the carriers in the concentrated (metallic) regime retain much of the character of the carriers in the dilute (photoexcited) regime. Together, these results imply that in the superconducting cuprates and in their parent'' insulators, the carriers are polarons dressed with a phonon polarization cloud.

• OSTI ID: 5999962
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 42:13; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
POLARONS
COPPER OXIDES
LANTHANUM OXIDES
THALLIUM OXIDES
YTTRIUM OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL INSULATORS
FREQUENCY DEPENDENCE
HIGH-TC SUPERCONDUCTORS
INFRARED RADIATION
PHONONS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
EQUIPMENT
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUASI PARTICLES
RADIATIONS
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
THALLIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties