Seebeck effect near quantum MIT in Eu1-xCaxB6. Physica Status Solidi (B) Basic Research Volume 250, Issue 3, March 2013, Pages 618-620
14 сентября 2018
402
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| Вид публикации | Статья |
| Контактные данные автора публикации | Glushkov, V.ab , Baybakov, R.c, Demishev, S.ab, Dukhnenko, A.d, Levchenko, A.d, Shitsevalova, N.d, Sluchanko, N.a a Prokhorov General Physics Institute of RAS, 38, Vavilov str., Moscow 119991, Russian Federation b Moscow I |
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Аннотация
We report the results of a Seebeck effect study carried out on the single crystals of Eu1-xCaxB6 (0≤x≤1) at temperatures 1.8-300K. The Seebeck coefficient is shown to be determined by the sum of the linear term S=AT and a phonon-drag contribution, which is induced by the local phonon mode of europium (calcium) with the characteristic frequency 7.3meV (9.1meV). The crossover from negative (A≈-0.23μVK-2 for x=0) to positive (A≈ 1.2μVK-2 for x=0.244) values of the diffusion thermopower indicates the smooth change of the band structure when approaching the hole-like conductivity found in Eu1-xCaxB6 at x>xC≈0.2. Copyright © 2013 WILEY-VCH Verlag GmbH
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