TY - JOUR
T1 - Ferroelectricity in an S=1/2 chain cuprate
AU - Park, S.
AU - Choi, Y. J.
AU - Zhang, C. L.
AU - Cheong, S. W.
PY - 2007/1/31
Y1 - 2007/1/31
N2 - 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 Pc increases with Hc, and Pa appears with Ha. 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.
AB - 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 Pc increases with Hc, and Pa appears with Ha. 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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U2 - 10.1103/PhysRevLett.98.057601
DO - 10.1103/PhysRevLett.98.057601
M3 - Article
AN - SCOPUS:33846657192
SN - 0031-9007
VL - 98
JO - Physical review letters
JF - Physical review letters
IS - 5
M1 - 057601
ER -