Japanese Journal of Applied Physics · 1987 · 111 citations · 13 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSolid State PhysicsCritical PhenomenaInorganic MaterialsPhase DiagramsPhase EquilibriaPhase TransitionsSuperconducting MaterialsCritical ConcentrationCritical Oxygen ConcentrationCritical TemperatureCuprate SuperconductorsHigh-temperature SuperconductivityHigh-temperature SuperconductorsOxygen DependenceSuperconducting Critical Temperature
A study of precise oxygen concentration dependence of the superconducting volume fraction in Ba2YCu3Oy (6.22≤y≤6.96) revealed the phase diagram of this superconducting system. Three characteristic phases are found based on the oxygen concentration: (1) a nonsuperconducting tetragonal phase for 6.2<y<6.4, (2) a low-Tc (Tc= 55∼70 K) orthorhombic phase for 6.4≤y<6.8 and (3) a high-Tc (Tc=90 K) orthorhombic phase for 6.8≤y<7.0. Evidence for a distinct critical concentration at y=6.7∼6.8, necessary to sustain the bulk high-Tc (90 K) superconductivity, is presented.
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Structure of the single-phase high-temperature superconductor YBa2Cu3O7−δ
Mark A. Beno, L. Soderholm, D. W. Capone et al. · Applied Physics Letters · 1987 · 665 citations
High T<sub>c</sub>Superconductivity of La-Ba-Cu Oxides
Shin‐ichi Uchida, H. Takagi, K. Kitazawa et al. · Japanese Journal of Applied Physics · 1987 · 490 citations