Abstract
The effect of oxygen content on the vortex phase diagram of untwinned YBa 2Cu 3O y (YBCO) single crystals has been studied by magnetization and resistivity measurements in high magnetic fields up to 30 T. The cantilever magnetometry with a capacitance torque meter has been developed for precise magnetization measurement in high magnetic field. As for fully oxidized and optimally doped YBCO, the magnetic properties near the first-order vortex lattice melting transition line are discussed in comparison with the vortex phase diagram obtained from the resistivity measurement.
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