Abstract
Using an ac calorimetric method, the specific heat of pure single-crystalline Ni has been measured over a temperature range of 100 K centered at the Curie point (∼ 631 K). The experimental method permits continuous observation of vs with a temperature resolution of ∼ 0.01 K using very small specimens (∼ 7.8 mg). Special attention has been devoted to the determination of the analytical form of the magnetic contribution to . The effect of applied fields up to 240 Oe has also been studied. At zero field, the data fit a standard power-law expression over the range , with exponents . The data obtained with applied field follow the scaling relations calculated by Griffiths from the magnetic equation of state. The observed rounding of the specific-heat curve at its maximum is discussed and some experimental factors which influence the degree of the observed rounding are described.
- Received 6 August 1970
DOI:https://doi.org/10.1103/PhysRevB.3.924
©1971 American Physical Society