Spin Noncollinearlity in Multiferroic Phase of Triangular Lattice Antiferromagnet CuFe1-xAlxO2
作者： Taro Nakajima , Setsuo Mitsuda , Shunsuke Kanetsuki , Karel Prokes , Andrei Podlesnyak
关键词: Neutron diffraction 、 Multiferroics 、 Polarization density 、 Magnetic structure 、 Hexagonal lattice 、 Antiferromagnetism 、 Ferroelectricity 、 Materials science 、 Spin (physics) 、 Condensed matter physics 、 General Physics and Astronomy
摘要: We report a neutron diffraction study of the magnetic field- and impurity-induced ferroelectric states triangular lattice antiferromagnet CuFe 1- x Al O 2 . The structure phase was elucidated to be not cycloidal structure, which can successfully lead electric polarization through formula P ∝ e i j ×( S × ) [H. Katsura et al. : Phys. Rev. Lett. 95 (2005) 057205], but proper helical structure. Nevertheless, fact that ordering appears only in among various magnetically ordered phases strongly suggests spin noncollinearlity is relevant multiferroic nature
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