Thermal-difference reflectance spectroscopy of the high-temperature cuprate superconductors
- Department of Chemistry and Department of Physics, Stanford University, Stanford, California 94305 (United States)
- Department of Chemistry, Stanford University, Stanford, California 94305 (United States)
- Department of Physics, Stanford University, Stanford, California 94305 (United States)
The temperature-dependent thermal-difference reflectance (TDR) spectra of thin-film samples of Tl{sub 2}Ba{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10}, (BiPb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10}, Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8}, and YBa{sub 2}Cu{sub 3}O{sub 7} have been measured for photon energies between 0.3 and 4.5 eV at temperatures above and below each material{close_quote}s superconducting critical temperature. The amplitude of the characteristic optical structure near the screened plasma frequency of each sample in the normal-state TDR spectrum varies approximately linearly with temperature, {ital T}, indicating that the temperature-dependent optical scattering rate in these materials scales with temperature as {ital T}{sup 2}. From the TDR spectra collected above and below the critical temperature of each sample, the superconducting to normal-state reflectance ratio, {ital R}{sub {ital S}}/{ital R}{sub {ital N}}, has been obtained. In all of these spectra, there are significant deviations from unity in {ital R}{sub {ital S}}/{ital R}{sub {ital N}} at photon energies on the order of 2.0 eV. This optical structure cannot be accounted for using the conventional Mattis-Bardeen description of the optical properties of a superconductor or its strong-coupling extension where electron-pairing interactions are limited to energies less than 0.1 eV. However, both the temperature and energy dependence of the structure in the {ital R}{sub {ital S}}/{ital R}{sub {ital N}} spectra may be adequately described within Eliashberg theory with an electron-boson coupling function which consists of both a low-energy component ({lt}0.1 eV) and a high-energy component located between 1.6 and 2.1 eV. {copyright} {ital 1996 The American Physical Society.}
- DOE Contract Number:
- FG03-86ER45245
- OSTI ID:
- 282067
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 10; Other Information: PBD: Mar 1996
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM OXIDES
OPTICAL PROPERTIES
BISMUTH OXIDES
CALCIUM OXIDES
CUPRATES
HIGH-TC SUPERCONDUCTORS
LEAD OXIDES
THALLIUM OXIDES
YTTRIUM OXIDES
SUPERCONDUCTING JUNCTIONS
BOSON-FERMION SYMMETRY
CHARGE EXCHANGE
D STATES
ELECTRON-PHONON COUPLING
GORKOV-ELIASHBERG THEORY
LAYERS
PAIRING INTERACTIONS
SPECTRAL REFLECTANCE
SPECTROSCOPY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TRANSITION TEMPERATURE