Photoemission study on electronic structure of TiSe2

Authors :: Negishi, S.
Negishi, H.
Shimada, K.
Cui, X.Y.
Higashiguchi, M.
Nakatake, M.
Arita, M.
Namatame, H.
Taniguchi, M.
Ohnishi, A.
Sasaki, M.
Source :: Physica B. Aug2006, Vol. 383 Issue 1, p155-157. 3p.
Publication Year :: 2006
Abstract: Abstract: We have examined core-level photoemission spectra of 1T-TiSe2 and 1T-TaS2 to study chemical shifts associated with unusual superlattice formation. While large temperature-dependent core-level splitting was observed for TaS2, temperature-dependent chemical shift was not observed for TiSe2. On the other hand, angle-resolved valence-band photoemission spectra of TiSe2 showed appearance of a new branch (band-folding) at the L points in the ordered phase at 50K. These results suggest smaller lattice distortion in TiSe2 than that in TaS2. [Copyright &y& Elsevier]