Optical conductivity of single crystals of La sub 2 minus x Sr sub x NiO sub 4
Journal Article
·
· Physical Review, B: Condensed Matter; (USA)
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY (USA)
- Purdue University, West Lafayette, IN (USA). Department of Physics Purdue University, West Lafayette, IN (USA). Department of Chemistry
Reflectance data (50--50 000 cm{sup {minus}1}) on single crystals of La{sub 2{minus}{ital x}}Sr{sub {ital x}}NiO{sub 4} ({ital x}=0,0.2) are used to determine the {ital a}-{ital b} plane optical conductivity ({sigma}{sub 1}). Similar to the La cuprates, Sr doping introduces a strong mid-ir band in {sigma}{sub 1} with a peak at 0.6 eV. The {sigma}{sub 1} data are not in agreement with the marginal Fermi-liquid model proposed recently, but are rather well described by a modified Drude-Lorentz model. The hole plasma is overdamped and exhibits a large effective mass {ital m}{approximately}30{ital m}{sub 0}. The mid-ir band is well fit by a broad Lorentz oscillator, suggesting a collective mode; its origin cannot be ascribed to interband transitions involving Sr states, or to charge-transfer absorption.
- DOE Contract Number:
- FG05-84ER45151
- OSTI ID:
- 6197179
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:7; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Wed Mar 31 23:00:00 EST 1999
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· Physical Review, B: Condensed Matter; (USA)
·
OSTI ID:5844968
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
COLLECTIVE EXCITATIONS
CRYSTALS
EFFECTIVE MASS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMI GAS
FLUIDS
GASES
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
MASS
MONOCRYSTALS
NICKEL COMPOUNDS
NICKELATES
OPTICAL PROPERTIES
OSCILLATOR STRENGTHS
OXYGEN COMPOUNDS
PHOTOCONDUCTIVITY
PHYSICAL PROPERTIES
PLASMONS
QUASI PARTICLES
RARE EARTH COMPOUNDS
SPECTRAL REFLECTANCE
STRONTIUM ADDITIONS
STRONTIUM ALLOYS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
COLLECTIVE EXCITATIONS
CRYSTALS
EFFECTIVE MASS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY-LEVEL TRANSITIONS
EXCITATION
FERMI GAS
FLUIDS
GASES
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
MASS
MONOCRYSTALS
NICKEL COMPOUNDS
NICKELATES
OPTICAL PROPERTIES
OSCILLATOR STRENGTHS
OXYGEN COMPOUNDS
PHOTOCONDUCTIVITY
PHYSICAL PROPERTIES
PLASMONS
QUASI PARTICLES
RARE EARTH COMPOUNDS
SPECTRAL REFLECTANCE
STRONTIUM ADDITIONS
STRONTIUM ALLOYS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS