Structure and superconductivity of HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}}
- Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
We have investigated the structure, defect concentration, and superconducting properties of HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} by neutron powder diffraction, thermogravimetric analysis, and ac susceptibility. Samples with three oxygen contents and {ital T}{sub {ital c}}`s ranging from 135 to 94 K, obtained through different annealing conditions, were studied. Two defect sites were observed in all samples. The concentration of defect oxygen atoms located at a site in the center of the Hg-O{sub {delta}} plane, is found to vary from 0.18(2) to 0.10(2) oxygen atoms per formula unit as {ital T}{sub {ital c}} decreases from 135 to 94 K. An additional defect, which we interpret as oxygen atoms associated with the substitution of Cu on the Hg site, is found to have a fixed concentration of {similar_to}0.09(2) oxygen atoms per formula unit.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 54946
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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