Features of low-temperature structural phase transitions in La-cuprates

Yoichi Horibe, Yasuhide Inoue, Yasumasa Koyama

    Research output: Contribution to journalArticle

    Abstract

    In order to elucidate features of low-temperature structural phase transitions in La 1.5Sr 0.1Nd 0.4CuO 4, in-situ observation was performed by transmission electron microscopy. A series of dark field images using the 100 forbidden spot reveal that there are two types of sites for the nucleation of the LTO/LTT phase; that is , the twin boundary between neighboring LTO I domains and the interior of the domain. When the temperature is lowered from the LTO I phase, the LTO/LTT phase is first nucleated along the twin boundary around 120 K and exhibits a lateral growth, which is relatively suppressed. As a result of the suppression, the LTO/LTT region nucleated along the boundary is never extended in a whole area. On further cooling to 12 K, the LTO/LTT phase with a spotty-shape also appears in the interior of the LTO I domain. The most interesting feature of the spotty-shape phase is that on aging at 12 K some LTO/LTT regions nucleated inside the domain are annihilated and then appear again That is the growth of the LTO/LTT phase in the interior of the domain exhibits a very unique behavior. The present data suggest that the unique behavior originates from the interaction between the order parameter and the spontaneous strain accompanied by the transition.

    Original languageEnglish
    Pages (from-to)1006-1011
    Number of pages6
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume61
    Issue number9
    Publication statusPublished - 1997

    Fingerprint

    cuprates
    Phase transitions
    Nucleation
    Aging of materials
    Transmission electron microscopy
    Cooling
    Temperature
    retarding
    nucleation
    cooling
    transmission electron microscopy
    interactions
    temperature

    Keywords

    • La-cuprate
    • Low-temperature structural phase transition
    • T suppression
    • Transmission electron microscopy
    • Tweed pattern

    ASJC Scopus subject areas

    • Metals and Alloys

    Cite this

    Features of low-temperature structural phase transitions in La-cuprates. / Horibe, Yoichi; Inoue, Yasuhide; Koyama, Yasumasa.

    In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 61, No. 9, 1997, p. 1006-1011.

    Research output: Contribution to journalArticle

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    AU - Inoue, Yasuhide

    AU - Koyama, Yasumasa

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