Oxygen dependence of the linear term in the specific heat of YBa sub 2 Cu sub 3 O sub 7 minus. delta

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.6329· OSTI ID:7122676

Collocott, S J; Driver, R ^[1]; Vance, E R ^[2]

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1. Commonwealth Scientific and Industrial Research Organization, Lindfield, Australia 2070 (AU) Division of Applied Physics, Lindfield, Australia 2070 (AU)
2. Advanced Materials Program, ANSTO, Lucas Heights, Australia 2234 (AU)

Specific-heat data in the range 0.4--20 K for a polycrystalline specimen of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, prepared by the mixing of aqueous nitrate solutions, are reported as a function of oxygen content and compared with similar measurements made on specimens prepared by the powder ceramic route. On deoxygenation from {delta}=0 to 1, the linear specific-heat coefficient {gamma}{sub 0} and Debye temperature {ital FTHETA}{sub {ital D}}{sup 0} decrease by 1.7{plus minus}0.7 mJ/mol K{sup 2} and 80{plus minus}20 K, respectively, with {gamma}{sub 0} attaining its smallest value of 2.86 mJ/mol K{sup 2} in the YBa{sub 2}Cu{sub 3}O{sub 6} specimen prepared by the nitrate route. It appears that {gamma}{sub 0} is largely extrinsic in origin, but a component of it is correlated to the oxygen content of the material. It is not possible to say whether this component is intrinsic to the superconducting state or is merely a property of the material, being due to some other source such as two-level systems.

• OSTI ID: 7122676
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:10; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
SPECIFIC HEAT
STOICHIOMETRY
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES