Changes of spin dynamics in multiferroic Tb1-xCaxMnO3

A.A. Nugroho, Risdiana, N. Mufti, T.T.M. Palstra, M.O. Tjia

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    Abstract

    We report the results of a series of pSR measurements performed on polycrystalline and single crystalline Tb1-xCaxMnO3, with x = 0, 0.05 and 0.1. Analysis of the data indicates that the Neel transition temperature around 40 K for the undoped sample is in agreement with the previous result obtained by susceptibility measurement. We further find a peculiar behavior related to the relaxor ferroelectric of magnetic origin for 5% Ca doping. This type of relaxor is suggested to be governed by spin fluctuations due to inhomogeneity in the spiral magnetic ordering induced by the A-site Ca doping. It is shown that the 5% Ca doping appears to induce faster reduction of spin fluctuation with decreasing temperature. Our pSR data in applied longitudinal fields (LF) also indicate the possible occurrence of inhomogeneous internal field although a more detailed study is required for its clarification and verification.
    Original languageEnglish
    Pages (from-to)785-788
    Number of pages4
    JournalPhysica B
    Volume404
    DOIs
    Publication statusPublished - 15 Apr 2009

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