Superconductivity and hole source in Hg(Ba[sub 2[minus]x]Sr[sub x])CuO[sub 4+[delta]]

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1994.1121· OSTI ID:6977010

Subramanian, M A ^[1]; Whangbo, M H ^[2]

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1. E.I. due Pont de Nemours and Company, Wilmington, DE (United States)
2. North Carolina State Univ., Raleigh, NC (United States)

Mercury cuprates Hg(Ba[sub 2[minus]x]Sr[sub x])CuO[sub 4+[delta]](x = 0.0-0.7) were synthesized, and their structure and superconductivity were characterized. Single phases of Hg(Ba[sub 2[minus]x]Sr[sub x])CuO[sub 4+[delta]] can be obtained for x = 0.0-0.7; they crystallize in a tetragonal structure, and their a- and c-parameters decrease smoothly with increasing x. The superconducting transition temperature of Hg(Ba[sub 2[minus]x]Sr[sub x])CuO[sub 4+[delta]] decreases with increasing x, and superconductivity vanishes for x [ge] 0.5. These observations and tight-binding electronic band structure calculations suggest that the hole source of Hg(Ba[sub 2[minus]x]Sr[sub x])CuO[sub 4+[delta]] is not the Hg 6s band but the interstitial oxygen atoms in the HgO[sub [delta]] sheet.

• DOE Contract Number: FG05-86ER45259
• OSTI ID: 6977010
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 109:2; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BAND THEORY
BARIUM COMPOUNDS
CHEMICAL PREPARATION
COPPER COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUPRATES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
HOLES
LATTICE PARAMETERS
MERCURY COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
SUPERCONDUCTIVITY
SYNTHESIS
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS