@article{oai:nagoya.repo.nii.ac.jp:00018681, author = {Soda, Kazuo and Harada, Shota and Kato, Masahiko and Yagi, Shinya and Inukai, Manabu and Miyazaki, Hidetoshi and Sandaiji, Yusuke and Tamada, Yuko and Tanaka, Suguru and Sugiura, Takahiro and Nishino, Yoichi}, issue = {3–6}, journal = {Journal of Electron Spectroscopy and Related Phenomena}, month = {Apr}, note = {The valence-band and core-level photoemission spectra of n-type thermoelectric Heusler(L21)-type alloys Fe2 − x − yIryV1 + xAl and p-type ones Fe2 − xV1 + x − yTiyAl have been studied to clarify the origin of the enhancement of their thermoelectric power. It is found that the excess V content x (V-rich for x > 0 and Fe-rich for x < 0) causes the drastic change in the valence-band electronic structure within the binding energy of ∼0.7 eV near the Fermi level EF and the evolution of the satellite structures in the V 2p core-level spectra with x increased. These spectral features are ascribed to the formation of the Fe or V anti-site defects in the off-stoichiometric alloys with non-zero x. The shift of the valence-band and core-levels towards the high (low) binding energy side is observed on partial substitution y of Ir (or Ti) for Fe (or V), which is attributed to the EF shift due to the common band formation with the Ir 5d or Ti 3d states incorporated into the main Fe–V 3d bands. The enhancement of the thermoelectric power in those Heusler-type alloys can be explained in terms of the observed changes in the valence-band electronic structure near EF., Advances in Vacuum Ultraviolet and X-ray Physics. The 37th International Conference on Vacuum Ultraviolet and X-ray Physics (VUVX2010)}, pages = {236--239}, title = {Soft X-ray photoemission study of thermoelectric alloys Fe2−x−yIryV1+xAl and Fe2−xV1+x−yTiyAl}, volume = {184}, year = {2011} }