Field dependence of the specific heat of single-crystalline ZrZn2

Abstract We present measurements of the specific heat C of a single crystal of ZrZn2 in the range 2–30 K, at magnetic field B up to 14 T. For B=0 and low temperature the specific heat varies as C≈γT+βT3, where γ≈45 mJ/mol K2 and β corresponds to a Debye temperature Θ D ≈340 K . Magnetic field reduces γ by up to 30% at 14 T. The variation of γ with B is compared with predictions of a self-consistent model of the magnetic equation of state, where phenomenological parameters are taken from the DC magnetization and neutron scattering.