Magnetic ground state and transition of a quantum multiferroic LiCu2O2 |
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Authors: | Huang S W Huang D J Okamoto J Mou C Y Wu W B Yeh K W Chen C L Wu M K Hsu H C Chou F C Chen C T |
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Institution: | National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan. |
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Abstract: | Based on resonant soft x-ray magnetic scattering, we report that LiCu2O2 exhibits a large interchain coupling which suppresses quantum fluctuations along spin chains, and a quasi-2D short-range magnetic order prevails at temperatures above the magnetic transition. These observations unravel the fact that the ground state of LiCu2O2 possesses long-range 2D-like incommensurate magnetic order rather than being a gapped spin liquid as expected from the nature of quantum spin-1/2 chains. In addition, the spin coupling along the c axis is found to be essential for inducing electric polarization. |
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