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Schlagwörter:
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Zusammenfassung:
We compare the relativistic LDA Fermi surface of Sr(2)RuO(4) to direct
experimental evidence of spin-orbit coupling from de Haas-van Alphen
experiments. The k-dependence of the Zeeman splitting at the Fermi
surface is modelled with a range of tight binding models of the
quasi-particle bands. Only a very restricted class of parameters are
consistent with evidence from the de Haas-van Alphen experiments for a
strong k-dependent Zeeman splitting on the alpha Fermi surface sheet.
The bare LDA bands do not lead to such a strong k-dependent Zeeman
splitting on this sheet, and this suggests that additional charge
transfer takes place as suggested by DMFT calculations. We conclude that
the overall scale of the spin-orbit coupling must be at least as large
as the several hundred kelvin deduced in previous work, and that this
must call into question any theory postulating rotation of the triplet
d-vector at small magnetic fields.
