The low temperature specific heat of hexagonal cobalt in a magnetic field

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Abstract
The specific heat of a spherical single crystal of hcp cobalt has been measured between 0.3 and 4K, and in magnetic fields of up to 5 T applied both parallel and normal to the c axis. After subtracting a small spin wave contribution the results have been fitted to the equation C= gamma T+AT3+BT-2. In zero external field the authors find gamma =4.46+or-0.07 mJ mole-1 K-2 and B=5.10+or-0.08 mJ mole-1 K, corresponding to a nuclear hyperfine field of 22.3+or-0.2 T. Within experimental error A was found to be independent of the applied field. Similarly gamma was independent of the magnitude of the field but appeared to depend on the direction of the magnetization such that ( gamma /sub ///))=4.47+or-0.015 mJ mole-1 K-2 (M//c axis), and ( gamma perpendicular to )=4.52+or-0.02 mJ mole-1 K-2 (MFc axis). The intrinsic nuclear hyperfine field was found to be independent of the applied field and of the orientation of the magnetization.