Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li0.99Cu0.01CrO2

被引：18

作者：

Dey, K. ^{[1
]}

Karmakar, A. ^{[1
]}

Majumdar, S. ^{[1
]}

Giri, S. ^{[1
]}

机构：

[1] Indian Assoc Cultivat Sci, Dept Solid State Phys, Kolkata 700032, India

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 09期

关键词：

FERROELECTRICITY; ANTIFERROMAGNET; MAGNETS;

D O I：

10.1103/PhysRevB.87.094403

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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. 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 (similar to 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. DOI: 10.1103/PhysRevB.87.094403

引用

页数：6

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