Eight new high-temperature superconductors with the 1:2:4 structure

Journal Article · Sat Apr 01 00:00:00 EST 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.7347· OSTI ID:6151430

Morris, D E; Nickel, J H; Wei, J Y.T.; Asmar, N G; Scott, J S; Scheven, U M; Hultgren, C T; Markelz, A G; Post, J E; Heaney, P J; others, and

New high-temperature superconducting compounds RBa/sub 2/Cu/sub 4/O/sub 8/ (R = Nd, Sm, Eu, Gd, Dy, Ho, Er, and Tm) which share the 1:2:4 structure of YBa/sub 2/Cu/sub 4/O/sub 8/ are bulk synthesized using a new high-pressure oxygen technique. All compounds show substantial Meissner diamagnetism ((3--25) x 10/sup -4/ emu/g at 20 K). Critical temperatures (57--81 K) vary inversely with ion size (opposite to 1:2:3), and directly with orthorhombic distortion (which is much smaller than in corresponding 1:2:3 compounds). R/sub 2/Ba/sub 4/Cu/sub 7/O/sub x/ compounds (with alternating blocks of 1:2:3: and 1:2:4) were also prepared. The variable oxygen stoichiometry of 1:2:3 is not shared by the 1:2:4 compounds.

• Research Organization: Physics Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
• OSTI ID: 6151430
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 39:10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
SUPERCONDUCTIVITY
COPPER OXIDES
DYSPROSIUM OXIDES
ERBIUM OXIDES
EUROPIUM OXIDES
GADOLINIUM OXIDES
HOLMIUM OXIDES
NEODYMIUM OXIDES
SAMARIUM OXIDES
THULIUM OXIDES
CRYSTAL STRUCTURE
MEISSNER-OCHSENFELD EFFECT
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
DYSPROSIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ERBIUM COMPOUNDS
EUROPIUM COMPOUNDS
GADOLINIUM COMPOUNDS
HOLMIUM COMPOUNDS
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SCATTERING
THERMODYNAMIC PROPERTIES
THULIUM COMPOUNDS
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