The specific heat of Gd near Tc is shown to scale with magnetic field in accordance with scaling law predictions. A surprisingly close agreement is found between the scaled data and the predictions of the spin- 1 2 Heisenberg model.
Bibliographical noteFunding Information:
* Supported in part by National Science Foundation Grant DMR 72-03026 and DMR 76-10379. t Present address: Knolls Atomic Power Laboratory, Schenectady, New York 12301, USA.
We wish to acknowledge the assistance of F.L. Lederman in obtaining exponents f6r the specific heat. One of us (MBS) acknowledges the hospitality of the Technical University of Munich and the support of the Alexander von Humboldt Foundation during the early stages of this work. We have benefited from helpful comments from P. Hohenberg.