Quantum size effect of 2DEG confined within BaTiO3/SrTiO 3: Nb Superlattices

Yuki Nakanishi, Hiromichi Ohta, Teruyasu Mizoguchi, Yuichi Ikuhara, Kunihito Koumoto

    Research output: Contribution to journalConference articlepeer-review

    Abstract

    Carrier transport properties such as carrier concentration (ne), Hall mobility (μHall) and Seebeck coefficient (S) for the superlattices of [(BaTiO3)x/(SrTi0.7Nb 0.3O3)1]z (x = 1, 4, 6, 9 and 15) were measured to clarify the critical barrier thickness for the electron confinement in a unit cell layer thickness of SrTi0.7Nb 0.3O3. The μHall values drastically decreased with the x-value due to the Ba-alloying occurred. We observed enhancement of |S| value in BaTiO3/SrTi1-xNb xO3 superlattices due to the quantum size effect, which is similar to SrTiO3/SrTi0.8Nb0.2O3 superlattices. Critical BaTiO3 layer thickness for fully confinement of the conduction electron significantly decreased (6 unit cells) as compared to that of SrTiO3/SrTi0.8Nb0.2O3 superlattices.

    Original languageEnglish
    Pages (from-to)375-380
    Number of pages6
    JournalMaterials Research Society Symposium Proceedings
    Volume1044
    Publication statusPublished - 2008 Oct 9
    EventThermoelectric Power Generation - Boston, MA, United States
    Duration: 2007 Nov 262007 Nov 29

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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