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Weak ferromagnetism and internal magnetoelectric effect in LiFeP_2O_7

机译:LiFeP_2O_7中的弱铁磁性和内部磁电效应

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摘要

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_N (≈) 27 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.
机译:研究了LiFeP_2O_7单晶的磁,热力学和热电性质,重点是电极化与磁序参数的磁电相互作用。发现低于T_N(≈)27 K的磁阶是倾斜的反铁磁体,其沿b轴具有弱的铁磁分量。 T_N处的热释电电流的尖峰证明了强的内部磁电相互作用,导致在磁序开始时极化大大降低。在T_N以下,外部磁场中的磁电效应将线性和二次磁场相关性结合在一起。热膨胀数据显示出较大的单轴磁弹性响应,并证明存在强自旋-晶格耦合。 LiFeP_2O_7是一种极性化合物,其磁序参数与极化和晶格之间具有很强的相互作用。

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