The magnetic properties of polycrystalline and single-crystal samples of YBa₂{Cu}₃O₇ are compared. Transition temperatures are in the range of 85 to 89 K. The Meissner effect is below 30% of the diamagnetic shielding in all cases. Based on the high-temperature susceptibility it is suggested that an itinerant antiferromagnetic $3d$ band of the Cu²⁺ is possible. Anisotropy occurs in the single crystal for applied fields above 200 Oe. There is a difference in the lower critical field of a factor of 20 where Hc1 is about 4000 Oe for H parallel to the orthorhombic c axis and 200 Oe for H perpendicular to the c axis of the crystal.
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McGuire et al. (1987) studied this question.
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