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Low temperature specific heat of YBa2Cu3O7−δ

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Citation

Caspary, R., Bredl, C. D., Spille, H., Winkelmann, M., Steglich, F., Schmidt, H., et al. (1988). Low temperature specific heat of YBa2Cu3O7−δ. Physica C, 153, 876-877. doi:10.1016/S0921-4534(88)80133-3.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-D4A6-4
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.