Synthesis, structure, and properties of the high-temperature superconductor HgBa{sub 2}CuO{sub 4+{delta}}

Journal Article · Thu May 01 00:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.12776· OSTI ID:496773

Hodges, J P; Gameson, I; Edwards, P P ^[1]; Kharel, A P; Porch, A ^[2]

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1. School of Chemistry, The University of Birmingham, Edgbaston, Birmingham, B15 2TT (United Kingdom)
2. School of Electrical Engineering, The University of Birmingham, Edgbaston, Birmingham, B15 2TT (United Kingdom)

We report here the attempted synthesis of (Hg{sub 1{minus}x}Cu{sub y})Ba{sub 2}CuO{sub 4+{delta}} (0{le}x{le}0.2, 0{le}y{le}0.2, y{le}x) and the results of a detailed characterization of the structural and superconducting properties of the resulting samples. Rietveld refinement of powder x-ray-diffraction data collected on all 15 samples synthesized found no partial Cu occupancy of the Hg site. We therefore conclude that for these samples no solid solution exists and the superconducting phase is simply HgBa{sub 2}CuO{sub 4+{delta}}. Only one interstitial oxygen position O(3) was found, located exactly at the center of the Hg plane. An analysis of the structural refinements has produced a number of correlations between the exact location of the Ba{sup 2+} cation within the unit cell and a number of important superconducting parameters; these include the occupancy of the O(3) site, the extent of oxidation of the CuO{sub 2} planes, and the magnetic penetration depth. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 496773
• Journal Information: Physical Review, B: Condensed Matter, Vol. 55, Issue 18; Other Information: PBD: May 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
PHYSICAL PROPERTIES
MERCURY OXIDES
BARIUM OXIDES
COPPER OXIDES
CRYSTAL STRUCTURE
PENETRATION DEPTH
PHASE STUDIES