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Author Romero, D. B. ♦ Porter, C. D. ♦ Tanner, D. B. ♦ Forro, L. ♦ Mandrus, D. ♦ Mihaly, L. ♦ Carr, G. L. ♦ Williams, G. P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ BISMUTH OXIDES ♦ ELECTRIC CONDUCTIVITY ♦ CALCIUM OXIDES ♦ COPPER OXIDES ♦ STRONTIUM OXIDES ♦ BCS THEORY ♦ HIGH-TC SUPERCONDUCTORS ♦ INFRARED SPECTRA ♦ INTERFERENCE ♦ QUASI PARTICLES ♦ RELAXATION TIME ♦ SCATTERING ♦ TEMPERATURE DEPENDENCE ♦ ALKALINE EARTH METAL COMPOUNDS ♦ BISMUTH COMPOUNDS ♦ CALCIUM COMPOUNDS ♦ CHALCOGENIDES ♦ COPPER COMPOUNDS ♦ ELECTRICAL PROPERTIES ♦ OXIDES ♦ OXYGEN COMPOUNDS ♦ PHYSICAL PROPERTIES ♦ SPECTRA ♦ STRONTIUM COMPOUNDS ♦ SUPERCONDUCTORS ♦ TRANSITION ELEMENT COMPOUNDS 360207* -- Ceramics, Cermets, & Refractories-- Superconducting Properties-- (1992-)
Abstract The low-frequency conductivity {sigma}{sub 1}({omega}) of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} has a Drude-like component below {ital T}{sub {ital c}}. Interpreting the width of this component as the quasiparticle relaxation rate ({tau}{sup {minus}1}), we find that {tau}{sup {minus}1} decreases dramatically just below {ital T}{sub {ital c}}, in sharp contrast with the {ital T}-linear {tau}{sup {minus}1} above {ital T}{sub {ital c}} and Bi{sub 2}Sr{sub 2}CuO{sub 6}. This decrease causes a peak in {sigma}{sub 1}({omega}{r arrow}0,{ital T}) for {ital T} just below {ital T}{sub {ital c}}, a peak which is due to the scattering rate and not to pair coherence effects, consistent with the lack of a coherence peak in the NMR relaxation rate. This result implies that the excitations which scatter the carriers are suppressed below {ital T}{sub {ital c}}.
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1992-03-09
Publisher Place United States
Journal Physical Review Letters
Volume Number 68
Issue Number 10


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