Accession Number:

AD0716799

Title:

Localized Spin Fluctuations in Metals,

Descriptive Note:

Corporate Author:

PENNSYLVANIA UNIV PHILADELPHIA DEPT OF PHYSICS

Report Date:

1970-01-01

Pagination or Media Count:

33.0

Abstract:

The concepts and results of several theories of localized spin fluctuations are contrasted. The random phase approximation--qualitatively correct for weak exchange coupling U--overemphasizes the collective nature of the fluctuations and in dilute alloys leads to an unphysical instability for U or U sub c. For U approximately equal to U sub c, nonlinear interactions between spin fluctuations suppress the instability. These anharmonic effects have been treated through the functional average and the diagram summation schemes, and they lead to a smooth variation of the system properties as U increases through U sub c. A complementary treatment in which one studies the time-evolution of spin fluctuations is also considered. Author

Subject Categories:

  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE