Magnetocapacitance effect and related microstrucuture in Ti-doped YMnO3

S. Mori, J. Tokunaga, Y. Horibe, Y. Aikawa, Takuro Katsufuji

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    Abstract

    We have investigated microstructures giving rise to magnetocapacitance effect in Ti-doped YMnO3 (YMn1-xTixO3) by both electron diffraction and real-space imaging techniques. Diffuse scattering elongating along the [110] direction due to the instability of the Mn trimerization were found in the x=0.175 compound, which exhibits the enhanced magnetocapacitance effect. With increasing Ti concentration, the centrosymmetric (paraelectric) R3̄c phase grows up at the expense of the ferroelectric P63cm phase around x=0.20 and the R3̄c phase is dominant above x=0.30. Our present results indicate that the Mn trimers with the short-range correlation inside the ferroelectric nanodomains with the 10-20nm size should be responsible for the enhancement of the magnetocapacitance and, on the other hand, the appearance of the R3̄c phase suppressed the magnetocapacitance effect.

    Original languageEnglish
    Article number224434
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume72
    Issue number22
    DOIs
    Publication statusPublished - 2005 Dec 1

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    ASJC Scopus subject areas

    • Condensed Matter Physics

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