Antiferromagnetic-to-ferrimagnetic phase transition with large electric-polarization change in a frustrated polar magnet CaBaCo4O7
Antiferromagnetic-to-ferrimagnetic phase transition with large electric-polarization change in a frustrated polar magnet CaBaCo4O7
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DOI：
10.1103/physrevb.103.184412
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发表时间：
2021-05
影响因子：
3.7
通讯作者：
Tsuyoshi Omi;Yoshito Watanabe;N. Abe;H. Sagayama;A. Nakao;K. Munakata;Y. Tokunaga;T. Arima
中科院分区：
文献类型：
--
作者：
Tsuyoshi Omi;Yoshito Watanabe;N. Abe;H. Sagayama;A. Nakao;K. Munakata;Y. Tokunaga;T. Arima
We investigate phase transitions of a geometrically frustrated polar magnet ${\mathrm{CaBaCo}}_{4}{\mathrm{O}}_{7}$, which exhibits the largest magnetoelectric (ME) effect in multiferroic compounds reported so far. Measurements of magnetization, sound velocity, and neutron diffraction of single crystals reveal an antiferromagnetic phase between the ferrimagnetic transition temperature ${T}_{\mathrm{C}}\ensuremath{\sim}60$ $\mathrm{K}$ and ${T}^{*}\ensuremath{\sim}69$ $\mathrm{K}$. In the antiferromagnetic phase, the ordered Co moments on the triangular layers remain nearly disordered. We demonstrate that a large electric-polarization change emerges upon the antiferromagnetic-to-ferrimagnetic transition. The large ME coupling can be attributed to the exchange striction.
We investigate phase transitions of a geometrically frustrated polar magnet ${\mathrm{CaBaCo}}_{4}{\mathrm{O}}_{7}$, which exhibits the largest magnetoelectric (ME) effect in multiferroic compounds reported so far. Measurements of magnetization, sound velocity, and neutron diffraction of single crystals reveal an antiferromagnetic phase between the ferrimagnetic transition temperature ${T}_{\mathrm{C}}\ensuremath{\sim}60$ $\mathrm{K}$ and ${T}^{*}\ensuremath{\sim}69$ $\mathrm{K}$. In the antiferromagnetic phase, the ordered Co moments on the triangular layers remain nearly disordered. We demonstrate that a large electric-polarization change emerges upon the antiferromagnetic-to-ferrimagnetic transition. The large ME coupling can be attributed to the exchange striction.