Accession Number : AD0764620

Title :   Unusual Phase Transition Behavior in Weakly Interacting Magnetic Cluster Substances: Application to Magnetic Cooling.

Descriptive Note : Technical rept.,

Corporate Author : CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF PHYSICS

Personal Author(s) : Bonner,Jill C. ; Friedberg,Simeon A.

Report Date : 16 JUL 1973

Pagination or Media Count : 12

Abstract : The statistical mechanics of a variety of magnetic cluster substances is discussed, with particular reference to the effects of weak inter-cluster interactions. It is shown that in the case of clusters with an energy gap between the singlet ground state and the excited states an unusual high-field transition may occur. The uses of cluster materials of this and related types in antiferromagnetic cooling by adiabatic magnetization are noted. A novel and more powerful method of cooling by adiabatic demagnetization of antiferromagnets is presented. (Author)

Descriptors :   (*ANTIFERROMAGNETISM, COOLING), CRYOGENICS, PHASE STUDIES, STATISTICAL MECHANICS

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE