High-resolution angle-resolved photoemission spectroscopy (ARPES) has been performed on a layered transition-metal dichalcogenide (TMDC) 1T-VSe 2 to study the (4×4) charge-density wave (CDW) mechanism. We observed a partial Fermi-surface (FS) nesting on the electronlike FS centered at the M (L) point. The spectral weight near EF is considerably suppressed below the transition temperature (Tc=110 K) around the nested portion, while a negligible spectral change is observed even across Tc in other portions of FS. This suggests that the CDW transition in 1T-VSe2 is caused by the three-dimensional FS nesting. Implications are discussed in relation to the physical properties of 1T-VSe2 as well as the ARPES results of other TMDC's.
|Number of pages||8|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2003 Oct|