Japanese Journal of Applied Physics · 1989 · 47 citations · 4 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSolid State PhysicsCrystal ChemistryCrystal LatticeCrystal SystemsCrystalline MaterialsCrystallographySuperconducting MaterialsCrystallographic SymmetryCuprate SuperconductorsHigh-temperature SuperconductivityHigh-temperature SuperconductorsSuperconducting CeramicsSuperconducting Critical TemperatureSuperconducting PropertiesX-ray Diffraction Analysis
We report on the superconductivity and crystal structures in Tl-(Ba, Sr)-Ca-Cu-O (TBSCC) system. In the case of TBSCC system, the 2223 phase was obtained as a single phase more easily compared with the Tl-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O systems. As a result, we achieved a high superconducting volume fraction, 95% above 100 K. The crystallographic transformation was caused by changing the ratio of Ba to Sr. By the X-ray diffraction and TEM analysis, the crystal structure was determined as a 2223 structure consisting of Tl-O bilayers in the Ba-rich side, and a 1223 structure consisting of Tl-O monolayer in the Sr-rich side.
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Sputter Deposition of BiSrCaCuO Thin Films
Masao Fukutomi, Junichi Machida, Yoshiaki Tanaka et al. · Japanese Journal of Applied Physics · 1988 · 692 citations
New 120 K Tl-Ca-Ba-Cu-O superconductor
Z. Z. Sheng, W. Kiehl, Joseph W. Bennett et al. · Applied Physics Letters · 1988 · 77 citations