Fundamental Oscillation Periods of the Interlayer Exchange Coupling beyond the RKKY Approximation

Details Fundamental Oscillation Periods of the Interlayer Exchange Coupling beyond the RKKY Approximation Fundamental Oscillation Periods of the Interlayer Exchange Coupling beyond the RKKY Approximation

1996-10-10

arxiv.org/abs/cond-mat/9610087v1

Physics

Condensed Matter

Strongly Correlated Electrons

34 pages, 10 figures ; to appear in J. Phys.: Condens. Matt

Scientific paper

10.1088/0953-8984/8/50/046

A general method for obtaining the oscillation periods of the interlayer exchange coupling is presented. It is shown that it is possible for the coupling to oscillate with additional periods beyond the ones predicted by the RKKY theory. The relation between the oscillation periods and the spacer Fermi surface is clarified, showing that non-RKKY periods do not bear a direct correspondence with the Fermi surface. The interesting case of a FCC(110) structure is investigated, unmistakably proving the existence and relevance of non-RKKY oscillations. The general conditions for the occurrence of non-RKKY oscillations are also presented.

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