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 La1.5Sr0.1Nd0.4CuO4, 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
DOIs
Publication statusPublished - 1997 Jan 1

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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