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Resonant magnetic X-ray diffraction study on the triangular lattice antiferromagnet GdPd$$_2$$Al$$_3$$

三角格子反強磁性体GdPd$$_2$$Al$$_3$$の共鳴磁気X線回折による研究

稲見 俊哉; 寺田 典樹*; 北澤 英明*; 酒井 治*

Inami, Toshiya; Terada, Noriki*; Kitazawa, Hideaki*; Sakai, Osamu*

Resonant magnetic X-ray diffraction experiments were carried out on the stacked triangular lattice antiferromagnet GdPd$$_2$$Al$$_3$$. The experiments revealed an expected initial collinear $$c$$-axis order at $$T_{rm N1}$$ followed by an additional in-plane order at $$T_{rm N2}$$, while at the same time we found that the ground state is a helically ordered state of a very long incommensurate period of approximately 700 ${AA}$. The distribution of K-domains was highly anisotropic, and the domain with the modulation vector normal to the surface of the crystal was ascendant. Low-field magnetization is discussed on the basis of the observed incommensurate magnetic structure.

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パーセンタイル:60.94

分野:Physics, Multidisciplinary

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