Journal of the Physical Society of Japan · 1996 · 750 citations · 13 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMaterials PhysicsSolid State PhysicsElectrical ConductivityHigh-temperature MaterialsMagnetic Properties Of SolidsMagnetism In SolidsPhase TransitionsSuperconducting MaterialsCuprate SuperconductorsElectrical Conductivity MeasurementsFrequency-dependent Electrical MeasurementsHigh-temperature SuperconductivityHigh-temperature SuperconductorsMagnetization MeasurementSuperconducting Critical TemperatureSuperconducting Properties
We have observed superconductivity in the ladder material Sr 0.4 Ca 13.6 Cu 24 O 41.84 under pressures of 3 GPa and 4.5 GPa by means of electrical measurements. The superconducting transition temperatures T c (onset) are 12 K and 9 K at 3 and 4.5 GPa, respectively. The superconducting volume fraction was obtained to be about 5% from magnetization measurement under 3.5 GPa at 4.2 K, indicating the bulk nature of the superconductivity in this system.
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