Rozbicki Emil J, Annett James F, Souquet Jean-René, Mackenzie Andrew P
Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK.
J Phys Condens Matter. 2011 Mar 9;23(9):094201. doi: 10.1088/0953-8984/23/9/094201.
We compare the relativistic LDA Fermi surface of Sr2RuO4 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.
我们将Sr2RuO4的相对论性LDA费米面与德哈斯-范阿尔芬实验中自旋轨道耦合的直接实验证据进行比较。通过一系列准粒子能带的紧束缚模型对费米面处塞曼分裂的k依赖性进行建模。只有非常有限的一类参数与德哈斯-范阿尔芬实验的证据一致，该证据表明在α费米面片上存在强烈的k依赖性塞曼分裂。裸LDA能带在该片上不会导致如此强烈的k依赖性塞曼分裂，这表明如DMFT计算所暗示的那样发生了额外的电荷转移。我们得出结论，自旋轨道耦合的整体尺度必须至少与先前工作中推断的几百开尔文一样大，并且这必然会对任何假设在小磁场下三重态d矢量旋转的理论提出质疑。
