Optical conductivity of single crystals of La sub 2 minus x Sr sub x NiO sub 4

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.4756· OSTI ID:6197179

Bi, X; Eklund, P C; McRae, E; Zhang, J ^[1]; Metcalf, P; Spalek, J; Honig, J M ^[2]

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1. Department of Physics and Astronomy, University of Kentucky, Lexington, KY (USA)
2. 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), Vol. 42:7; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
PHOTOCONDUCTIVITY
SPECTRAL REFLECTANCE
COLLECTIVE EXCITATIONS
EFFECTIVE MASS
FERMI GAS
LANTHANUM COMPOUNDS
MONOCRYSTALS
NICKELATES
OSCILLATOR STRENGTHS
PLASMONS
STRONTIUM ADDITIONS
ALLOYS
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
GASES
MASS
NICKEL COMPOUNDS
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUASI PARTICLES
RARE EARTH COMPOUNDS
STRONTIUM ALLOYS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties