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Abstract:
For T < 0.4K, the specific heat of YBa2Cu3O7−gd (δ = 0.13 and 0.99) can be decomposed into a nuclear term αT−2 and a linear term γT (γ = 20–30 mJ/KZ mole), which is strongly depressed by increasing the temperature as well as the external magnetic field. We attribute the γT term to a spin-glass type freezing mechanism. The large a-value (54 μJ/K mole) found for δ = 0.13 indicates considerable Zeeman splitting of nuclear spin states in the absence of both long-range magnetic order and an external magnetic field.
