Synthesis and properties of new family of superconducting copper oxides based on GaO layers

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:6073785

Dabrowski, B; Zhang-McCoy, V ^[1]; Radaelli, P; Mitchell, A W; Hinks, D G ^[2]; Vaughey, J T; Groenke, D A; Poeppelmeier, K R ^[3]

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1. Northern Illinois Univ., De Kalb, IL (United States). Dept. of Physics
2. Argonne National Lab., IL (United States)
3. Northwestern Univ., Evanston, IL (United States)

We have discovered the first layered superconducting copper oxide with small, fixed oxidation state cations separating the conducting CuO{sub 2} planes. This material, GaSr{sub 2}Y{sub 1-x}Ca{sub x}Cu{sub 2}O{sub 7}, is similar to YBa{sub 2}Cu{sub 3}O{sub 7} with the square planar copper chains replaced by chains of edge-shared GaO{sub 4} tetrahedra. Thus, oxidation can occur only for the copper ion located in square pyramidal coordination in the CuO{sub 2} plane. The undoped parent compound, x = 0, does not show magnetic order above 4K, probably due to the presence of the thick, ionic region separating the CuO{sub 2} planes. However, this ionic region does not suppress high {Tc} superconductivity ({approximately}70K) for the doped compositions.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE; National Science Foundation (NSF); STCS; USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6073785
• Report Number(s): ANL/CP-74583; CONF-9109102-5; ON: DE92005219
• Resource Relation: Conference: 5. annual conference on superconductivity and applications, Buffalo, NY (United States), 24-26 Sep 1991
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM OXIDES
SYNTHESIS
COPPER OXIDES
GALLIUM OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
ELECTRIC CONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
ORTHORHOMBIC LATTICES
SUPERCONDUCTIVITY
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELECTRICAL PROPERTIES
GALLIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360207 - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)