Abstract
Single-crystal growth of YBa2Cu3O7- delta has been studied using starting charges containing known amounts of Ag in the form of AgNO3. The as-grown crystals are found to undergo a sharp transition to the superconducting state at 90 K, showing that the addition of AgNO3 facilitates their oxygenation. The measured room-temperature resistivities, both in plane ( rho ab) and out of plane ( rho c), for the grown crystals are found to be the lowest among the values reported so far. The anisotropy in resistivity ( rho c/ rho ab) at 300 K is found to be roughly one-half of the value measured for the crystals grown from charges free from AgNO3. The angular dependence of transport critical current for the doped crystals has been measured at 82 K and for an applied magnetic field of 0.9 T. The results have been analysed using the existing theoretical models.
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