The crystal angle dependence of magnetization has been measured in spherically shaped, single-domain YBa 2 Cu 3 O x ͑YBCO͒. The single-domain sample is processed by a seeded-melt growth process in which a small NdBa 2 Cu 3 O x seed is used to induce domain growth through a peritectic reaction in YBCO. It has been found that the angle dependence of magnetization can be obtained in a series of zero-field-cooled hysteresis loop measurements with warm-ups well above T c between each measurement at

more »

... specific angle. In contrast to previously reported results, we have found that the angle dependence exhibits a sawtooth wave between 0°and 360°over a wide range of temperatures and fields. Furthermore, we have also measured the angle dependence on a YBCO plate and found similar behavior, indicating that the sawtooth wave is intrinsic to the superconductor. A physical model has been developed to explain the angle dependence of magnetization observed in this experiment.