Year: 2009
Type: article
Abstract: Soft-x-ray photoemission and absorption spectroscopies are employed to investigate the electronic structures of ${\text{Sr}}_{1\ensuremath{-}x}{\text{Rh}}_{2}{\text{O}}_{4}$. Similar to the layered cobaltates such as ${\text{Na}}_{1\ensuremath{-}x}{\text{CoO}}_{2}$, a valence-band satellite feature (VBS) occurs at higher binding energy to the $\text{O}\text{ }2p$ band. We find that the VBS resonates at the $\text{O}\text{ }1s$ edge. Additionally, core absorption shows clear $x$ dependence in the $\text{O}\text{ }1s$ edge rather than in the $\text{Rh}\text{ }3p$ edge. These results indicate that the holes in the initial state mainly have $\text{O}\text{ }2p$ character presumably due to $d\text{\ensuremath{-}}p$ rehybridizations affected by ${\text{Sr}}^{2+}$ vacancy potentials. The resultant inhomogeneous charge texture may have impact on the thermoelectric transport properties at low $x$.
Source: Physical Review B
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2083727299