Structure and superconductivity in Cr-substituted HgBa{sub 2}CuO{sub 4+8}.

Journal Article · Thu May 15 00:00:00 EDT 1997 · Physica C

DOI:https://doi.org/10.1016/S0921-4534(97)00134-2· OSTI ID:937983

Chmaissem, O; Jorgensen, J D; Hinks, D G; Storey, B G; Dabrowski, B; Zhang, H; Marks, L D

Chromium-substituted Hg{sub 1-x}Ba{sub 2}CuO{sub 4+{delta}} compounds have been synthesized. Cr can be incorporated into the structure with a solubility limit around x {approx} 0.27. Cr substitutes at the Hg site and is tetrahedrally coordinated to four oxygen atoms. Two of these are apical oxygen atoms that have moved to new positions (O2') and two are in the Hg/Cr plane (O3) at a (x x 0) site. Additional oxygen atoms (O4) in the Hg/Cr plane at (1/2 1/2 0) affect the carrier concentration, as for HgBa{sub 2}CuO{sub 4+{delta}}. In the as-synthesized samples, {Tc} decreases with increasing Cr content. Attempts to adjust the carrier concentration by post annealing in oxygen at low temperature destroy superconductivity because the samples are metastable under ambient conditions.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: ER
• DOE Contract Number: DE-AC02-06CH11357
• OSTI ID: 937983
• Report Number(s): ANL/MSD/JA-25206; PHYCE6; TRN: US200905%%632
• Journal Information: Physica C, Vol. 279, Issue May 15, 1997; ISSN 0921-4534
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
SUPERCONDUCTIVITY
MOLECULAR STRUCTURE
CHROMIUM OXIDES
MERCURY OXIDES
BARIUM OXIDES
COPPER OXIDES
SYNTHESIS
TRANSITION TEMPERATURE