Prog. Theor. Phys. Vol. 60 No. 6 (1978) pp. 1611-1623

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Inter-Atomic Interaction between Electrons. III

— Effect of Electron Correlation —

Tomohiko Kato, Tsuyoshi Aisaka^* and Eijiro Haga^**

Fukuoka Institute of Technology, Wajiro, Fukuoka 811-02
^*Department of General Education, Tottori University, Tottori 680
^**Department of Applied Physics, Faculty of Engineering, Nagoya University, Nagoya 464

(Received May 25, 1978)

Abstract:

The modification due to electron correlation of the effective exchange parameter I(q) in the q-dependent susceptibility are studied within the T-approximation in the presence of intra- and inter-atomic interactions. The expression for I(q) is obtained in the case of low electron density. It is divided into the RPA term \tildeI(q), in which the bare intra- and inter-atomic interactions are replaced by the modified ones, and a correction term I_c(q) which vanishes at q=0. The effective values of the electron interactions, in terms of which \tildeI(q) is described, are numerically calculated for the b.c.c. and f.c.c. structures. It is found that the important inter-atomic interactions are not so much reduced from their bare values by the correlation as the intra-atomic interaction is, and I_c(q) compensates somewhat the decreasing behavior of \tildeI(q) against q. In relation to our previous RPA analysis for I(q) in nickel, the q-dependence of I(q) is numerically evaluated. It is deduced from the result that the RPA analysis is not modified seriously by the correlation effect.

URL : http://ptp.ipap.jp/link?PTP/60/1611/
DOI : 10.1143/PTP.60.1611

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Citing Article(s) :

Progress of Theoretical Physics Vol. 61 No. 3 (1979) pp. 699-708 :
Effect of Inter-Atomic Interaction on Dynamic Susceptibility

Eijiro Haga, Tomohiko Kato and Tsuyoshi Aisaka