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

Conference · Wed Apr 01 00:00:00 EST 1992 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:5000269

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

---

1. Department of Physics, Northern Illinois University, DeKalb, IL 60115 (United States)
2. Materials Science Division, Argonne National Laboratory, Argonne, IL 60439 (United States)
3. Department of Chemistry, Northwestern University, Evanston, IL 60208 (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{minus}{ital x}}Ca{sub {ital 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, {ital 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 {ital T}{sub {ital c}} superconductivity ({similar to}70K) for the doped compositions.

• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 5000269
• Report Number(s): CONF-9109102-; CODEN: APCPC
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (United States), Vol. 251:1; Conference: 5. annual conference on superconductivity and applications, Buffalo, NY (United States), 24-26 Sep 1991; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM OXIDES
SYNTHESIS
COPPER OXIDES
GALLIUM OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
HIGH-TC SUPERCONDUCTORS
OXIDATION
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
GALLIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)