We have performed angle-resolved photoemission spectroscopy (ARPES) of KFeAgTe2, and revealed the absence of band crossing at the Fermi level (EF) indicative of the unconventional insulating nature of this material. Comparison of the ARPES-derived band dispersions with the first-principles calculations based on local density approximation and the inclusion of electron correlation U demonstrated that the ground state of KFeAgTe2 is not a simple band insulator. And also, our fitting result on the ARPES experimental density of states near EF plausibly excludes the possibility of Anderson insulator. We suggest that KFeAgTe 2 is most likely a Mott insulator or a Hund insulator, providing a deep insight into the insulating ground state.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2013 Oct 2|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics