Unusual impurity effects on the dielectric properties of CaCu 3-xMnxTi4O12

Wataru Kobayashi, I. Terasaki

    Research output: Contribution to journalArticle

    38 Citations (Scopus)

    Abstract

    CaCu3Ti4O12 has a large dielectric constant (ε∼104 at 300 K), which is almost constant above 100 K, followed by a 100-fold reduction below 100 K. The physical mechanism of this anomalous behavior has been extensively investigated. We found that only 2% substitution of Mn for Cu dramatically quenches the huge ε of 10 4 down to 100 over the measured temperature range from 4.2 to 300 K. In usual substitution effects, 2% impurity induces a tiny change in ε of the order of 2%. Thus the present substitution effect suggests that dipole moments cause fluctuating ferroelectric domains in CaCu3Ti 4O12, as is similar to the frustrated dipole glass in LuFe2O4.

    Original languageEnglish
    Pages (from-to)771-772
    Number of pages2
    JournalPhysica B: Condensed Matter
    Volume329-333
    Issue numberII
    DOIs
    Publication statusPublished - 2003 May

    Keywords

    • Dielectric constant
    • Impurity

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics

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