Antiferromagnetic-to-ferrimagnetic phase transition with large electric-polarization change in a frustrated polar magnet CaBaCo4O7

We investigate phase transitions of a geometrically frustrated polar magnet CaBaCo4 O7, 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 antiferromagne...

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Bibliographic Details
Published in:Physical review. B 2021-05, Vol.103 (18), p.1
Main Authors: Omi, Tsuyoshi, Watanabe, Yoshito, Abe, Nobuyuki, Sagayama, Hajime, Nakao, Akiko, Munakata, Koji, Tokunaga, Yusuke, Arima, Taka-hisa
Format: Article
Language:English
Subjects:
Acoustic velocity
Antiferromagnetism
Crystals
Neutron diffraction
Phase transitions
Polarization
Single crystals
Sound diffraction
Transition temperature
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Summary:We investigate phase transitions of a geometrically frustrated polar magnet CaBaCo4 O7, 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 TC ∼ 60 K and T* ∼ 69 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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.103.184412