Far-infrared linear response and radio-frequency nonlinear response of charge-density-wave conductors and high-T sub c superconductors
Thesis/Dissertation
·
OSTI ID:7033806
The far-infrared linear response of the charge-density-wave (CDW) conductor (TaSe{sub 4}){sub 2}I and polycrystalline samples of the high-T{sub c} superconductors LaSr{sub 1.85}Ca{sub 0.15}CuO{sub 4} and La{sub 1.85}Ca{sub 0.15}CuO{sub 4} was measured. The frequency and temperature range of the measurements is 8-350 cm{sup {minus}1} and 5 to 300K. At low temperatures in (TaSe{sub 4}){sub 2}I, a mode with giant oscillator strength was found at 38 cm{sup {minus}1}. At low temperatures in the high-T{sub c} superconductors, a reflectance edge was observed near 2.5k{sub B} T{sub c}. The BCS-like temperature dependence of the reflectance edge is suggestive of an energy-gap interpretation. However, a simple model shows that a BCS-like temperature dependence is also consistent with an interpretation of the reflectance edge as a low-frequency plasmon. It is not yet possible to deduce the magnitude of the energy gap directly from the FIR spectra of polycrystalline sample. The radio-frequency nonlinear response of the CDW conductor NbSe{sub 3} was also measured. In the presence of combined rf- and dc-electric fields, mode locking occurs in NbSe{sub 3}. Complete mode locking in conventional samples is found to dramatically suppress sliding CDW conduction fluctuations.
- Research Organization:
- California Univ., Berkeley, CA (USA)
- OSTI ID:
- 7033806
- Country of Publication:
- United States
- Language:
- English
Similar Records
Far infrared linear response and radio frequency nonlinear response of charge density wave conductors and high T/sub c/ superconductors. [(TaSe/sub 4/)/sub 2/I; La/sub 1. 85/Sr/sub 0. 15/CuO/sub 4/; La/sub 1. 85/Ca/sub 0. 15/CuO/sub 4/; ac-dc mode lock of NbSe/sub 3/]
Temperature-dependent far-infrared reflectance of La-Sr-Cu-O and La-Ca-Cu-O: Bardeen-Cooper-Schrieffer electrodynamics but uncertain energy gap
Electronic and mechanical properties of collective-mode conductors
Technical Report
·
Wed Jun 01 00:00:00 EDT 1988
·
OSTI ID:7144804
Temperature-dependent far-infrared reflectance of La-Sr-Cu-O and La-Ca-Cu-O: Bardeen-Cooper-Schrieffer electrodynamics but uncertain energy gap
Journal Article
·
Sun Jan 31 23:00:00 EST 1988
· Phys. Rev. B: Condens. Matter; (United States)
·
OSTI ID:5619803
Electronic and mechanical properties of collective-mode conductors
Thesis/Dissertation
·
Thu Dec 31 23:00:00 EST 1987
·
OSTI ID:7005590
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHARGE DENSITY
COPPER COMPOUNDS
CUPRATES
ELECTRIC CONDUCTORS
ELECTROMAGNETIC RADIATION
FAR INFRARED RADIATION
HALIDES
HALOGEN COMPOUNDS
INFRARED RADIATION
IODIDES
IODINE COMPOUNDS
LANTHANUM COMPOUNDS
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SELENIDES
SELENIUM COMPOUNDS
SPECTRAL REFLECTANCE
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TANTALUM COMPOUNDS
TANTALUM SELENIDES
TRANSITION ELEMENT COMPOUNDS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHARGE DENSITY
COPPER COMPOUNDS
CUPRATES
ELECTRIC CONDUCTORS
ELECTROMAGNETIC RADIATION
FAR INFRARED RADIATION
HALIDES
HALOGEN COMPOUNDS
INFRARED RADIATION
IODIDES
IODINE COMPOUNDS
LANTHANUM COMPOUNDS
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SELENIDES
SELENIUM COMPOUNDS
SPECTRAL REFLECTANCE
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TANTALUM COMPOUNDS
TANTALUM SELENIDES
TRANSITION ELEMENT COMPOUNDS