Japanese Journal of Applied Physics · 1989 · 27 citations · 0 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSolid State PhysicsCrystal ChemistryElectrical Properties Of CeramicsInorganic MaterialsStrongly Correlated Electron SystemsSuperconducting MaterialsThermal Properties Of CeramicsCuprate SuperconductorsHigh-temperature SuperconductivityHigh-temperature SuperconductorsSuperconducting CeramicsSuperconducting Critical TemperatureSuperconducting PropertiesTetragonal LatticesTetragonal System
The superconductivity and crystal structure of a Ln-Pb-Sr-Ca-Cu-O system, where Ln=Y or lanthanide, have been studied. The maximum onset temperature and zero resistance obtained for a nominal composition of YbPbSr 2 Ca 2 Cu 3 O x were 78 K and 64 K, respectively. This ceramic is composed of a new phase which has a tetragonal symmetry with a =3.81 Å and c =15.7 Å, and a second phase, Yb 2 SrO 4 .