Dzyaloshinskii-Moriya interaction and the magnetic ground state in magnetoelectric LiCoPO${}_4$

Abstract

Magnetic structures are investigated by means of neutron diffraction to shine a light on the intricate details that are believed to be key to understanding the magnetoelectric effect in LiCoPO${}_4$ . At zero field, a spontaneous spin canting of $\phi =7(1{)}^{\circ }$ is found. The spins tilt away from the easy $b$-axis toward $c$. Symmetry considerations lead to the magnetic point group $m_z^{\prime }$, which is consistent with the previously observed magnetoelectric tensor form and weak ferromagnetic moment along $b$. For magnetic fields applied along $a$, the induced ferromagnetic moment couples via the Dzyaloshinskii-Moriya interaction to yield an additional field-induced spin canting. An upper limit to the size of the interaction is estimated from the canting angle.

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Cited by in corpus (5)

• High-throughput determination of Hubbard U and Hund J values for transition metal oxides via linear response formalism
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• Magnetic structures and quadratic magnetoelectric effect in LiNiPO${}_4$ beyond 30T
• One- and two-magnon excitations in antiferromagnet PbFeBO4
• Magnetic structure and properties of a vanthoffite mineral Na6Mn(SO4)4