Published December 1, 1990 | Version v1
Journal article Metadata-only

Evidence for bulk oxygen in La2CuO4+δ: Specific-heat studies

Creators

  • 1. Department of Physics, University of Florida, Gainesville, FL (USA)
  • 2. Sandia National Laboratories, Albuquerque, NM (USA)

Description

Specific-heat measurements of a powder sample of La2CuO4+δ with δ∼0.13 indicate the presence of bulk oxygen, as determined by transitions at 24, 43.7, and 54.5 K as found in solid O2. A large difference in the cubic specific-heat temperature coefficients of a high-pressure-oxygenated superconducting sample and an ambient-pressure-oxygenated nonsuperconducting sample of La2CuO4+δ can be attributed to the unbound oxygen. Electronic specific-heat coefficients γ of the two samples are 2.4±0.3 and 0±0.3 mJ/K2 mol, respectively. Effects of bulk oxygen on measured thermodynamic properties of high-temperature superconductors are discussed

Additional details

Publishing Information

Journal Title
Physical Review, B: Condensed Matter
Journal Volume
42
Journal Issue
16
Series
Phys. Rev., B: Condens. Matter.
Journal Page Range
10016-10019
ISSN
0163-1829
CODEN
PRBMD

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
22050259
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
COPPER OXIDES; ELECTRONIC SPECIFIC HEAT; HIGH-TC SUPERCONDUCTORS; LANTHANUM OXIDES; OXYGEN; PRESSURE DEPENDENCE; STOICHIOMETRY; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; THERMODYNAMIC PROPERTIES; ULTRALOW TEMPERATURE; VERY LOW TEMPERATURE
Descriptors DEC
CHALCOGENIDES; COPPER COMPOUNDS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTS; LANTHANUM COMPOUNDS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SPECIFIC HEAT; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS