Fe-site occupancy and superconductivity in Y sub 1 minus z Ca sub z Ba sub 2 (Cu sub 1 minus x Fe sub x ) sub 3 O sub 6+ y

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.348216· OSTI ID:5690468

Smith, M G; Taylor, R D ^[1]; Oesterreicher, H ^[2]

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1. Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (USA)
2. Department of Chemistry, University of California, San Diego, La Jolla, California 92093 (USA)

X-ray diffraction and {sup 57}Fe Moessbauer spectroscopy studies show that partial substitution of Ca for Y in Y{sub 1{minus}{ital z}}Ca{sub {ital z}}Ba{sub 2}(Cu{sub 1{minus}{ital x}}Fe{sub {ital x}}){sub 3}O{sub 6+{ital y}} (0.05{le}{ital z}{le}0.15, 0.003{le}{ital x}{le}0.20) result in increased Fe solubility and a larger percentage of Fe occupancy of the Cu(2) plane site (prepared conventionally). Materials with {ital z}{gt}0.00 have a slightly depressed superconducting transition onset temperature {ital T}{sub {ital c}} relative to the {ital z}=0.00 compounds. It is also shown that Fe occupancy of the Cu(2) site in Y{sub 1{minus}{ital z}}Ca{sub {ital z}}Ba{sub 2}(Cu{sub 1{minus}{ital x}}Fe{sub {ital x}}){sub 3}O{sub 6+{ital y}} can be substantially increased when these materials are treated at high temperatures in inert atmospheres followed by oxygenation at low temperatures. {ital T}{sub {ital c}} decreases more rapidly in these latter materials compared to the conventionally prepared ones. Implications concerning ordered Fe-cluster formation and superconducting pair breaking in the Cu(2) site are drawn.

• OSTI ID: 5690468
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM ADDITIONS
CALCIUM ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EVEN-ODD NUCLEI
HEAT TREATMENTS
INTERMEDIATE MASS NUCLEI
IRON 57
IRON ADDITIONS
IRON ALLOYS
IRON ISOTOPES
ISOTOPES
MOESSBAUER EFFECT
NUCLEI
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SOLID CLUSTERS
SOLUBILITY
STABLE ISOTOPES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES