•A. Faißt¹, C. Pfleiderer¹, M. Uhlarz¹, H. v. Löhneysen^1,2, S. M. Hayden³ und G. G. Lonzarich^4
1Physikalisches Institut, Universität Karlsruhe
²Forschungszentrum Karlsruhe, Institut für Festkörperphysik
³University of Bristol, Bristol BS8 1TL, UK
⁴University of Cambridge, Cambridge CB3 0HE, UK

We present measurements of the specific heat C of a single crystal of ZrZn₂ in the range 2 K to 30 K, in an applied magnetic field B up to 14 T. For B = 0 and low temperature (T < 7K) the specific heat varies as C » gT+bT³ , where g » 45  mJ/mol K² and b corresponds to a Debye temperature Q_D » 340 K in agreement with earlier work. Magnetic field reduces g by up to 30 % at 14 T. The variation of g 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