论文信息 - Electrical Conduction Mechanism in Semiconducting KTaO3

Electrical Conduction Mechanism in Semiconducting KTaO3

Non-doped and Gd 2 O 3 -doped KTaO 3 single crystals were grown under various conditions of soaking time. It is found that KTaO 3 becomes semiconducting only for a long soaking procedure exceeding 24 hrs for both the non-doped and for the Gd 2 O 3 -doped crystals. It is concluded that the conduction electrons originate from oxygen vacancies acting as a donor in both crystals. Hall coefficient, electrical resistivity, Seebeck coefficient and specific heat were measured between liquid helium and room temperatures. The results suggest that many valley TO mode lattice scattering predominates below 200 K, and LO mode and intervalley mode lattice scattering predominates near room temperature besides TO mode.

J. Tanaka | Y. Miyazawa | M. Tsukioka

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