|Direct Probe of Mott-Hubbard to Charge-Transfer Insulator Transition|
|Tuesday, 20 September 2011 11:08|
Researchers report the most direct experimental verification of Mott-Hubbard and charge-transfer insulators using x-ray emission spectroscopy in transition-metal (TM) fluorides at Beamline 188.8.131.52. The p-d hybridization features in the spectra allow a straightforward energy alignment of the anion-2p and metal-3d valence states, which visually shows the difference between the two types of insulators. Furthermore, in parallel with the theoretical Zaanen-Sawatzky-Allen diagram, complete experimental systematics of the 3d Coulomb interaction and the 2p-3d charge-transfer energy are reported and could serve as a universal experimental trend for other TM systems including oxides.
Work performed on ALS Beamline 8.0.1
Citation: Olalde-Velasco, P., J. Jimenez-Mier, J.D. Denlinger, Z. Hussain, and W.L. Yang, "Direct probe of Mott-Hubbard to charge-transfer insulator transition and electronic structure evolution in transition-metal systems," Physical Review B: Condensed Matter and Materials Physics 83 (24), 241102(R) (2011).