Unusual valence, negative charge-transfer gaps and self-doping in transition-metal compounds

Details Unusual valence, negative charge-transfer gaps and self-doping in transition-metal compounds Unusual valence, negative charge-transfer gaps and self-doping in transition-metal compounds

2001-01-11

arxiv.org/abs/cond-mat/0101164v1

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 7 figures

Scientific paper

In this paper I discuss the electronic structure and properties of a specific, rather unconventional class of transition metal (TM) compounds, e.g. TM oxides, which formally have unusually high values of the oxidation state, or valence, of TM. In contrast to the typical situation, in this case the charge-transfer gap (excitation energy for the transfer of electrons from the ligands to the TM) is very small and may even become negative. As a result a profound modification of an electronic structure and of all the properties may take place: there appear holes in the oxygen p-bands (``self-doping''); the material may become the metal of a specific type; there may occur insulator--metal transitions of a specific type; magnetic properties may be quite different from the ones expected normally; the character of elementary excitations may change drastically. I give general discussion of such situation and consider several examples of corresponding systems and their specific properties.

Affiliated with

Also associated with

No associations

Rating

Unusual valence, negative charge-transfer gaps and self-doping in transition-metal compounds does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Unusual valence, negative charge-transfer gaps and self-doping in transition-metal compounds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unusual valence, negative charge-transfer gaps and self-doping in transition-metal compounds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-564473