•A. Faißt^{1}, C. Pfleiderer^{1}, M. Uhlarz^{1},
H. v. Löhneysen^{1,2}, S. M. Hayden^{3} und G. G.
Lonzarich^{4}
^{1}Physikalisches Institut, Universität Karlsruhe
^{2}Forschungszentrum Karlsruhe, Institut für Festkörperphysik
^{3}University of Bristol, Bristol BS8 1TL, UK
^{4}University of Cambridge, Cambridge CB3 0HE, UK

We present measurements of the specific heat C of a single crystal of
ZrZn_{2} 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+bT^{3}
, where g »
45 mJ/mol K^{2} 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.