Abstract
Specific heat was measured with adiabatic method for samples of Ba 2GdCu 3O 7−y with different oxygen compositions. Oxygen doping was no effects on magnetic transition temperature ( Tm) and specific heat above Tm but a little effects on specific heat below Tm. At the temperatures well below Tm, specific heat follows a law, Cm = AT s , with s ∼ 2.0, which is not compatible with 3-D antiferromagnetic or ferromagnetic ordering but with 2-D antiferromagnetic ordering or spin-glass freezing. The unaffected magnetic ordering temperature by oxygen doping indicates that the dominant magnetic interaction in these materials is the dipole-dipole interaction.
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