Japanese Journal of Applied Physics · 1987 · 87 citations · 5 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsCrystal StructureSolid State PhysicsCritical PhenomenaMagnetic Properties Of SolidsMagnetism In SolidsPhase TransitionsStrongly Correlated Electron SystemsSuperconducting MaterialsCritical TemperatureCuprate SuperconductorsHigh-temperature SuperconductorsImpuritiesIron-based SuperconductorsMeissner EffectSuperconducting Critical TemperatureSuperconducting Properties
A systematic study on the superconductivity of Y 1 Ba 2 (Cu 1- x Fe x ) 3 O y has been made down to 30 mK for various x values. The critical temperature decreases linearly with x . The complete Meissner effect is retained down to 30 mK, up to about x =0.10. The crystal structure of the superconducting phase was found to transform from the orthorhombic to the tetragonal between x =0.02 and 0.05. It is concluded that a branching effect of a one-dimensional chain of Cu1-O through Fe impurities is essential for this structure transition. The supercurrent is considered to flow on the two-dimensional sheets of Cu2.
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Crystal Structure of Superconductor Ba_2YCU_ O_
Shôichi Sato, Ichiroh Nakada, T. Kohara et al. · Japanese Journal of Applied Physics · 1987 · 15 citations