Accession Number : AD0700564

Title :   STUDIES OF THE IONIC FERROMAGNET (LaPb)MnO3. II. STATIC magnetization properties from 0 TO 800K,

Corporate Author : MANITOBA UNIV WINNIPEG DEPT OF PHYSICS

Personal Author(s) : Leung,L. K. ; Morrish,A. H. ; Searle,C. W.

Report Date : 18 JUN 1969

Pagination or Media Count : 7

Abstract : The static magnetization of the family of compounds La(1-x)Pb(x)MnO3 (0.25 < x < 0.45) has been measured from close to absolute zero to about 800K. The compounds are ferromagnetic, with Curie temperatures ranging from 315 to 350K. At absolute zero, the magnetization agrees to within 3% of that expected from the average spin per formula unit. The spontaneous magnetization decreases more rapidly than predicted by the Brillouin function for a normal ferromagnet for 0.9 < T/T(c) < 1. Just above the Curie temperature, the reciprocal susceptibility versus temperature curve exhibits a slight curvature; at higher temperatures the susceptibility follows the Curie-Weiss Law. The average spin obtained from the Curie constant agrees well with that obtained from the chemical formula. It is concluded that the ferromagnetism has its origin primarily in the itinerant d electrons that lie in a narrow double-exchange band, although lattice distortion may also have an influence. (Author)

Descriptors :   (*MANGANATES, *FERROMAGNETIC MATERIALS), MAGNETIC PROPERTIES, LEAD COMPOUNDS, LANTHANUM COMPOUNDS, CRYSTAL LATTICES, SOLID SOLUTIONS, CANADA

Subject Categories : Electricity and Magnetism
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE