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Ferroelectricity in an s=1/2 chain cuprate.

Authors
  • Park, S
  • Choi, Y J
  • Zhang, C L
  • Cheong, S-W
Type
Published Article
Journal
Physical review letters
Publication Date
Feb 02, 2007
Volume
98
Issue
5
Pages
57601–57601
Identifiers
PMID: 17358898
Source
Medline
License
Unknown

Abstract

We report our discovery of ferroelectricity in the spiral-magnetic state in the quantum quasi-one-dimensional (1D) S=1/2 magnet of LiCu2O2. Electric polarization (P) emerges along the c direction below the spiral-magnetic order temperature, but changes from the c to a axis when magnetic fields (H) are applied along the b direction. We also found that P(c) increases with H(c), and P(a) appears with H(a). LiCu2O2 in zero field appears to be the first ferroelectric cuprate and also a prototypical example of the "1D spiral-magnetic ferroelectrics." However, the unexpected behavior in H may demonstrate the complexity of the ordered spin configuration, inherent in the 1D S=1/2 magnet of LiCu2O2.

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