科研之友
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摘要
Valence band spectra (VBS) and its modification across Curie temperature (T-C) of Sr2CoO4 thin film are studied using resonant photoemission spectroscopy. It is found that VBS mainly consists of hybridized states of Co-3d t(2g)e(g) and O-2p; however, Co-3d e(g) states show its prominence only in the ferromagnetic temperature regime. Below T-C, spectral weight transfer takes place anomalously from high binding energy (B. E.) region to low B. E. region, signifying the enhanced intermediate or low spin state Co4+ ions. It is suggested that spin-lattice coupling and many-body effects in Sr2CoO4 derived from the strong electron correlations lead to such temperature dependence of VBS.
- 出版日期2014-5-5
