The specific heats of magnetically-ordered materials

Long Range Order. Ferromagnetism and Antiferromagnetism

“…A general discussion of specific heats of magnetically ordered materials has been provided by Cracknell and Tooke [10]. Now, an antiferromagnetic (AF) substance will generally follow the Curie-Weiss law above 7;,.…”

“…2.5 H 20 to discuss one of the most elegant recent experiments [44] in magnetism, a field-induced magnetic ordering. At this point, the pairs may be thought of in terms of a system with effective spin .Cf" =1, in 10 [44], the salt can undergo a phase transition to long-range order by interpair interaction. The material cannot undergo long range ordering under normal conditions because the predominant pair-wise interaction offers a path to remove all the entropy as the temperature goes to zero.…”

Thermodynamic Data of Gadolinium–Strontium Phosphate

“…This anomaly on the low-temperature heat capacity curve is probably a downward branch of the magnetic disorder–order phase transition, which is outside the measurement range of the calorimeter. Such anomalies have not yet been studied calorimetrically for eulytite phosphates, but they are known for other classes of substances (for example, refs − ). A detailed study of the magnetic susceptibility of Sr 3 Gd­(PO 4 ) 3 at the same temperatures is necessary to clarify the nature of the low-temperature C p ( T ) anomaly.…”