文章基本信息

标题：Double Charge Ordering States and Spin Ordering State Observed in a RFe₂O₄ System
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作者：Fei Sun ; Rui Wang ; C. Aku-Leh 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep06429
出版社：Springer Nature
摘要：Charge, spin, and lattice degrees of orderings are of great interest in the layered quantum material RFe₂O₄ (R = Y, Er, Yb, Tm, and Lu) system. Recently many unique properties have been found using various experimental methods. However so far the nature of the two-dimensional (2D) charge ordering (CO) state is not clear and no observation of its fine structure in energy has been reported. Here we report unambiguous observation of double 2D CO states at relatively high temperature in a polycrystalline Er_0.1Yb_0.9Fe₂O₄ using Raman scattering. The energy gaps between the 3D and the double 2D states are 170 meV (41.2 THz) and 193 meV (46.6 THz), respectively. We also observed a spin ordering (SO) state at below 210 K with characteristic energy of 45 meV (10.7 THz). Our investigation experimentally identified new fine structures of quantum orders in the system, which also extends the capability of optical methods in investigating other layered quantum materials.