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Use of Green's Function to s–d Interaction in Ferromagnetism

✍ Scribed by I. Nicoarǎ

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
387 KB
Volume
54
Category
Article
ISSN
0370-1972

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✦ Synopsis

Abstract

The influence of the s‐d interaction on the ferromagnet with S = 1/2 with nearest‐neighbour exchange interaction has been considered using the double‐time Green's functions. The equations of motion have been obtained for two kinds of Green's functions G(−) and G(+), which are derived using commutator and anticommutator, respectively. Expressions are given for the energy shift and damping caused by the s–d interaction, using the decoupling approximation proposed by Katsura and Horiguchi.

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Kondo compounds exhibit a rich phase diagram, which involves different types of magnetic ordering and superconductivity, depending on temperature, pressure and electron concentration. In the Kondo lattice model, we develop the chain of equations of motion generated by the conduction electron Green's