@article{oai:nagoya.repo.nii.ac.jp:00010156,
 author = {Wang, Yifeng and Lee, Kyu Hyoung and Hyuga, Hideki and Kita, Hideki and Inaba, Katsuhiko and Ohta, Hiromichi and Koumoto, Kunihito},
 issue = {24},
 journal = {APPLIED PHYSICS LETTERS},
 month = {Dec},
 note = {We found that Sm^3+ substitution in SrO(SrTiO_3)_2 is effective in improving the Seebeck coefficient (S). The |S| value increases notably with temperature, benefiting from an enhancement of the density of states (DOS) effective mass m_d from 〰3m_0 (300 K) to 〰7.5m_0 (1000 K), due to an improvement of the local symmetry of TiO_6 octahedra, enhancing the degeneracy in the Ti 3d orbitals, which form the conduction band (CB), and also to an accompanying lattice expansion, which gives rise to a higher DOS at the bottom of the CB and, consequently, a larger m_d.},
 pages = {242102--242102},
 title = {Enhancement of Seebeck coefficient for SrO(SrTiO_3)2 by Sm substitution: Crystal symmetry restoration of distorted TiO_6 octahedra},
 volume = {91},
 year = {2007}
}