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Evidence of enhanced pinning properties in optimally doped Bi2Sr2Ca1−<i>x</i>Y<i>x</i>Cu2O8+δ single crystals
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1996
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Superconducting MaterialMagnetic PropertiesEngineeringSolid-state ChemistryMagnetismSuperconductivityQuantum MaterialsHigh Tc SuperconductorsMaterials ScienceHigh-tc SuperconductivityPhysicsCrystalline DefectsComparative StudyCrystallographySolid-state PhysicBi2sr2ca1−xyxcu2o8+δ Single CrystalsApplied PhysicsCondensed Matter PhysicsDifferent Yttrium Contents
A comparative study of the magnetic properties of Bi2Sr2Ca1−xYxCu2O8+δ single crystals with different yttrium contents is presented. An optimum in the doping can be reached that corresponds to a high Tc (onset) value (91.5 K) and a high position of the irreversibility line. Moreover, the fishtail feature disappears for this optimally Y doped Bi-2212 crystal due to the increase of the magnetic field dependence of the critical current density. This demonstrates the better pinning efficiency of the crystals with the highest Tc.