Abstract
Magnetic mesurement of tetragonal YBa 2Cu 3O 6+x ( x≈0.05 to 0.35) has revealed that: 1) magnetization at 0.5 K is extremely nonlinear against the applied field, and very small (about 0.03 μ B/formula-unit) even at 7 T, and 2) the susceptibility, χ, above 150 K has been fitted to χ= χ 0+ C/( T− Θ) with Θ≈70 K. These behaviors have been reasonably explained from a molecular field model, which leads to a ferromagnetic coupling between Cu's in Cu(1) site caused by a spin-canting of Cu in Cu(2) site.
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