@article{oai:nagoya.repo.nii.ac.jp:00029313, author = {Nakano, Akitoshi and Nagai, Takayuki and Katayama, Naoyuki and Sawa, Hiroshi and Taniguchi, Hiroki and Terasaki, Ichiro}, issue = {11}, journal = {Journal of the Physical Society of Japan}, month = {Nov}, note = {We have measured the dielectric constant and thermopower of single crystal samples of the excitonic insulator candidate Ta2NiSe5. The dielectric constant below 50 K shows relaxor-like relaxation, implying the existence of randomly distributed electric dipoles. We have evaluated the concentration of the dipoles to be 10^19 cm^−3 at 30 K, which gives a rough estimate of the exciton concentration in this compound. A large thermopower of 600 µV/K at 100 K suddenly drops toward zero down to 50 K, and this zero thermopower evidences the neutral particles flow against the applied temperature gradient. We have semi-quantitatively explained the above two anomalies in terms of spontaneously generated excitons at low temperatures where thermally excited holes are quenched., ファイル公開:2020/11/15}, title = {Exciton Transport in the Electron–Hole System Ta2NiSe5}, volume = {88}, year = {2019} }