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2023-01-16T04:30:10Z
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High-resolution soft x-ray photoelectron study of density of states and thermoelectric properties of the Heusler-type alloys (Fe_{2/3}V_{1/3})_{100−y}Al_y
Soda, K.
14307
Murayama, H.
14308
Shimba, K.
14309
Yagi, S.
14310
Yuhara, J.
14311
Takeuchi, T.
14312
Mizutani, U.
14313
Sumi, H.
14314
Kato, M.
14315
Kato, H.
14316
Nishino, Y.
14317
Sekiyama, A.
14318
Suga, S.
14319
Matsushita, T.
14320
Saitoh, Y.
14321
The high-resolution soft x-ray photoelectron study of Heusler(L2_1)-type (Fe_{2/3}V_{1/3})_{100−y}Al_y (y=23.8−25.8) alloys directly confirms the correlation between their thermoelectric properties and the electronic structures near the Fermi level. It shows the rigid-band-like shift of the main 3d bands and the increase of the photoelectron intensity at the Fermi edge with the small deviation of the Al content from stoichiometry, i.e., y=25.0. This implies the existence of the pseudogap across the Fermi level in Fe_2VAl. The Seebeck coefficients evaluated from the present spectroscopic data agree well with the experimental ones as well as the values estimated from a theoretical density of states in a rigid-band model, while the shift is much smaller than what is expected in the rigid-band model. The small modification of the electronic structure in the offstoichiometric (Fe_{2/3}V_{1/3})_{100−y}Al_y alloys may be attributed to the lower contribution of Al to the electronic states near E_F.
journal article
The American Physical Society
2005-06-15
application/pdf
Physical Review B
24
71
245112
245112
http://hdl.handle.net/2237/7130
1098-0121
https://nagoya.repo.nii.ac.jp/record/5524/files/PhysRevB_71_245112.pdf
eng
https://doi.org/10.1103/PhysRevB.71.245112
Copyright: American Physical Society, All rights reserved.