Synthesis and properties of new family of superconducting copper oxides based on GaO layers
- Northern Illinois Univ., De Kalb, IL (United States). Dept. of Physics
- Argonne National Lab., IL (United States)
- 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, Washington, DC (United States); National Science Foundation, Washington, DC (United States); Illinois Univ., Urbana, IL (United States). Science and Technology Center for Superconductivity
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10112908
- 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; Other Information: PBD: [1991]
- Country of Publication:
- United States
- Language:
- English
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