Abstract
By quenching the tetragonal phase during crystal growth of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and then oxygenating the crystals without mechanical stress, we obtain some essentially untwinned crystals. Magnetic measurements on such crystals, with fields applied along the {ital a} or {ital b} axis, show anisotropy. A qualitative analysis of our relaxation and hysteresis data indicates that the critical current density is higher along {ital a} than along {ital b} (the chain direction). The anisotropic Meissner percent data show that pinning is higher for fields along {ital b} than along {ital a}.
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