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TT: Tiefe Temperaturen

TT 16: Postersitzung II: Amorphe und Tunnelsysteme, Mesoskopische Systeme, Schwere Fermionen, Kernmagnetismus

TT 16.45: Poster

Dienstag, 27. März 2001, 14:30–17:00, Rang S\ 3

Field Dependence of the Specific Heat of Single-Crystalline ZrZn₂ — •A. Faißt¹, C. Pfleiderer¹, M. Uhlarz¹, H. v. Löhneysen^1,2, S. M. Hayden³, and G. G. Lonzarich⁴ — 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≈ γ T+β T³ , where γ ≈ 45  mJ/mol K² and β corresponds to a Debye temperature Θ _D≈ 340 K in agreement with earlier work. 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.