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Addendum to $lqlq Doping-Dependent Magnetic Structure of Tb$_{1-x}$$Ca$$_{x}$$MnO$$_{3}$$ rqrq

「Tb$$_{1-x}$$Ca$$_{x}$$MnO$$_{3}$$における磁気構造のドーピング依存性」への補遺

町田 晃彦; 守友 浩*; 大山 研司*

Machida, Akihiko; Moritomo, Yutaka*; Oyama, Kenji*

Tb$$_{1-x}$$Ca$$_{x}$$MnO$$_{3}$$ ($$0.5 leq x leq 1.0$$) の低温における粉末中性子構造解析を行い、格子構造と磁気構造との相関について研究を行った。$$0.65 leq x leq 0.85$$ の領域において、磁気構造はCE-like型とC型反強磁性が共存している。この領域における低温での粉末回折パターンは、空間群$$Pnma$$$$P2_{1}/m$$で表される2つのペロフスカイト構造の2相モデルで再現できる。これら2相の分率は組成に対して変化し、磁気反射強度と組成に対する変化が類似してる。これよりそれぞれの相の磁気構造を同定した。さらに構造パラメータを詳細に調べ、磁気構造との相関を考察した。

In order to investigate interrelation between the lattice structure and the magnetic structure, we have performed Rietveld structural analysis on the neutron powder patterns for Tb$$_{1-x}$$Ca$$_{x}$$MnO$$_3$$ at low temperature. In the concentration range of $$0.65 leq x leq 0.85$$, we observed the Bragg reflections due to the CE-like- and C-type structures. In this range, the powder patterns were reproduce by the two-phase model with $$Pnma$$ and $$P2_{1}/m$$ symmetries. The fractions of these phases change against concentration $$x$$. This variation of the fraction for the $$Pnma$$ phase is similar to the variation of the integrated intensities of the CE-like-type magnetic Bragg reflections. This indicates that the $$Pnma$$ phase is responsible for the CE-like spin-ordering. Furthermore, we discussed interrelation between the detailed lattice structure and magnetic structure.

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