观察Ca₂RuO₄轨道序过渡
强关联电子
2009-11-11 v1
摘要
在Ru的L₂和LIII吸收边处进行共挨X射线衍射，用于探讨Ca₂RuO₄单晶中的磁性和轨道有序性。在特征antiferromagnetic有序性波矢处观察到电偶极2p→4d跃迁的显著共挨增强。除了在T_N=110 K已知的antiferromagnetic相变外，还观察到在约260 K处的两个-paramagnetic相之间的额外相变。根据衍射信号的极化和方位角依赖性，可将该相变归因于Ru t₂g电子的轨道有序性。该轨道序的传播矢量与Ca₂RuO₄轨道态的某些理论预测不一致。
引用
@article{arxiv.cond-mat/0508258,
title = {Orbital ordering transition in Ca$_2$RuO$_4$ observed with resonant x-ray diffraction},
author = {I. Zegkinoglou and J. Strempfer and C. S. Nelson and J. P. Hill and J. Chakhalian and C. Bernhard and J. C. Lang and G. Srajer and H. Fukazawa and S. Nakatsuji and Y. Maeno and B. Keimer},
journal= {arXiv preprint arXiv:cond-mat/0508258},
year = {2009}
}
备注
to appear in PRL