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This work reports an experimental study on the temperature dependence of the structural parameters of LiCrO2 (LCO) and Li0.99Cu0.01CrO2 (LCCO) by using a synchrotron x-ray diffraction technique. A significant magnetoelastic coupling is revealed by the anomalies observed in lattice parameters at the magnetic and electric phase transitions, apparent as steplike features in both Cr-O and Li-O bond lengths, as well as in O-Cr-O bond angles (see Figure 1). Magnetic, dielectric, and electric polarization measurements reveal the antiferromagnetic and antiferroelectric (AFE) ordering at 119 and 61 K, respectively, for LCCO. Interestingly, a fairly large uncompensated spontaneous electric polarization appears for LCCO in contrast to nearly compensated polarization value for LCO below the AFE ordering. This is correlated to the structurally driven enhancement (~4 times) of the interlayer Cr-O-Li/Cu-O-Cr superexchange interaction for LCCO. We argue that strong magnetoelastic coupling holds the key for the observed uncompensated spontaneous electric polarization in LCCO.

physical review b

Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.99</mml:mn></mml:mrow></mml:msub></mml:math>Cu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.01</mml:mn></mml:mrow></mml:msub></mml:math>CrO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" …

Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li0.99Cu0.01CrO