Volume 113, Number 2, January 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 February 2016|
Magnetism and magnetoelectricity in the polar oxide α-Cu2V2O7
1 Department of Physics, Pohang University of Science and Technology - Pohang, 790-784, Korea
2 c-CCMR, Pohang University of Science and Technology - Pohang, 790-784, Korea
3 Max Planck POSTECH Center for Complex Phase Materials - Pohang, 790-784, Korea
4 Department of Physics, University of Virginia - Charlottesville, VA 22904-4714, USA
Received: 20 October 2015
Accepted: 3 February 2016
Single crystals of the orthorhombic polar oxide α-Cu2V2O7 with space group Fdd2 are synthesized and their physical properties are measured. Neutron powder diffraction is also performed on a polycrystal sample to extract the magnetic structure. The ground state is shown to be weakly ferromagnetic, that is, collinearly antiferromagnetic in the a-direction with a small remanent magnetization in the c-direction. When an external magnetic field is applied in the c-direction, further spin canting, accompanied by the induced electric polarization, occurs. It is demonstrated that the magnetoelectric effect in α-Cu2V2O7 is adequately described if spin-dependent hybridization due to spin-orbit coupling as well as magnetic domain effects are simultaneously taken into account. We discuss the implication of the present result in the search for materials with multiferroicity and/or magnetoelectricity.
PACS: 75.85.+t – Magnetoelectric effects, multiferroics / 75.25.-j – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.) / 75.10.-b – General theory and models of magnetic ordering
© EPLA, 2016
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