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Title: Visualization of ferroelectric domains in a hydrogen-bonded molecular crystal using emission of terahertz radiation

Using a terahertz-radiation imaging, visualizations of ferroelectric domains were made in a room-temperature organic ferroelectric, croconic acid. In as-grown crystals, observed are ferroelectric domains with sizes larger than 50-μm square, which are separated by both 180° and tail-to-tail domain walls (DWs). By applying an electric field along c axis (the polarization direction), a pair of 180° DWs is generated and an each 180° DW oppositely propagates along a axis, resulting in a single domain. By cyclic applications of electric fields, a pair of 180° DWs repeatedly emerges, while no tail-to-tail DWs appear. We discuss the usefulness of the terahertz-radiation imaging as well as the observed unique DW dynamics.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Chiba 277-8561 (Japan)
  2. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562 (Japan)
  3. (JST), Tokyo 102-0076 (Japan)
Publication Date:
OSTI Identifier:
22311177
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DOMAIN STRUCTURE; ELECTRIC FIELDS; EMISSION; FERROELECTRIC MATERIALS; HYDROGEN; IMAGES; MOLECULAR CRYSTALS; ORGANIC MATTER; POLARIZATION; TEMPERATURE RANGE 0273-0400 K; THZ RANGE