Applied Physics Letters · 1989 · 36 citations · 15 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid-state ChemistryThin FilmsSuperconducting MaterialsSuperconducting Thin FilmsThin Film AnnealingThin Film Electrical PropertiesThin-film MaterialsCritical TemperatureCuprate SuperconductorsGrain Size MeasurementHigh-temperature SuperconductorsSuperconducting Critical TemperatureSuperconducting PropertiesThin-film SuperconductorsX-ray Fluorescence Spectroscopy
We have fabricated superconducting thin films on MgO(100) substrates with nearly pure Tl2Ba2Ca2Cu3O10 (2:2:2:3) phase using pulsed laser evaporation and post-annealing. The films had c axes perpendicular to the substrates. Superconducting films with onset temperatures of 125 K and zero resistance at 110 K were obtained. X-ray microprobe fluorescence measurements indicate that a typical composition of films is Tl0.66Ba1.77Ca1.46Cu3Ox, which is low in Tl compared to that expected for the 2:2:2:3 phase. A typical grain size is greater than 10 μm as revealed by scanning electron microscopy.
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Bulk superconductivity at 120 K in the Tl–Ca/Ba–Cu–O system
Z. Z. Sheng, A. M. Hermann · Nature · 1988 · 1.1K citations
100-K superconducting phases in the Tl-Ca-Ba-Cu-O system
Robert M. Hazen, L. W. Finger, R. J. Angel et al. · Physical Review Letters · 1988 · 414 citations