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Ferroelectric polarization and magnetic structure in Eu$$_{0.595}$$Y$$_{0.405}$$MnO$$_{3}$$

強電気分極とEu$$_{0.595}$$Y$$_{0.405}$$MnO$$_{3}$$の磁気構造

梶本 亮一 ; 横尾 哲也*; 古府 麻衣子*; 野田 耕平*; 桑原 英樹*

Kajimoto, Ryoichi; Yokoo, Tetsuya*; Kofu, Maiko*; Noda, Kohei*; Kuwahara, Hideki*

Eu$$_{0.595}$$Y$$_{0.405}$$MnO$$_3$$$$T_mathrm{N}=47$$K以下の温度で反強磁性転移を示す。$$T_mathrm{C}^c=25$$K以下で$$c$$軸方向に自発分極($$P$$)が生じるが、$$P$$の向きは$$T_mathrm{C}^a=23$$K以下で$$a$$軸方向へ変化する。$$P$$と磁気構造の関係を調べるために、Eu$$_{0.595}$$Y$$_{0.405}$$MnO$$_3$$の単結晶試料に対して中性子回折実験を行った。中性子回折実験は高エネルギー加速器研究機構(KEK)のパルス中性子研究施設KENSに設置されている熱外中性子回折計EXCEDで行った。非整合波数ベクトル$$(0, 0.31, 1)$$を持つ磁気ブラッグ反射を観測した。散乱ベクトル$$mathbf{Q}$$がほぼ$$b$$軸に平行な磁気ブラッグピークと、ほぼ$$c$$軸に平行なものの強度を比較することで、$$P$$が出現する温度、及びその向きが変わる温度にて磁気構造が変化していることが確認できた。磁気散乱強度の変化は誘電特性の変化に応じてスパイラル磁気構造が形成され、また、その容易面が変化しているとして解釈でき、最近の理論とも整合する。

Eu$$_{0.595}$$Y$$_{0.405}$$MnO$$_3$$ shows an antiferromagnetic transition below $$T_N = 47$$K. A spontaneous ferroelectric polarization $$P$$ along $$c$$ appears below $$T_C^c = 25$$K. The direction of $$P$$ then switches to $$a$$ below $$T_C^a = 23$$K. To investigate the relation between $$P$$ and the magnetic structure (MS), we have performed a neutron diffraction study using EXCED diffractometer installed at KENS spallation neutron facility of KEK. Magnetic Bragg peaks with a wave vector (0,0.31,1) were observed. By comparing a magnetic Bragg peak whose scattering vector $$bf{Q}$$ is almost parallel to $$b$$ and that with $$bf{Q}$$ almost parallel to $$c$$, we have succeeded in observing the change of the MS at the temperature ($$T$$) where $$P$$ appears and at $$T$$ where $$P$$ changes its polarization direction. Our observations can be interpreted as formation of a spiral spin structure and change of its easy plane in response to the change of the dielectric properties.

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パーセンタイル:73.45

分野:Chemistry, Multidisciplinary

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