The magnetic, thermodynamic, and pyroelectric properties of LiFeP 2O 7 single crystals are investigated with emphasis on the magnetoelectric interaction of the electrical polarization with the magnetic order parameter. The magnetic order below T N27 K is found to be a canted antiferromagnet with a weak ferromagnetic component along the b axis. A sharp peak of the pyroelectric current at T N proves the strong internal magnetoelectric interaction resulting in a sizable polarization decrease at the onset of magnetic order. The magnetoelectric effect in external magnetic fields combines a linear and a quadratic field dependence below T N. Thermal expansion data show a large uniaxial magnetoelastic response and prove the existence of strong spin-lattice coupling. LiFeP 2O 7 is a polar compound with a strong interaction of the magnetic order parameter with the electric polarization and the lattice.
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||Published - 2012 9月 10|
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