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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Crystallographic and magnetic properties of the mixed-valence oxides CaRu_(1-x)Mn_xO_3
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Crystallographic and magnetic properties of the mixed-valence oxides CaRu_(1-x)Mn_xO_3

机译：混合价氧化物CaRu_（1-x）Mn_xO_3的晶体学和磁性

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The crystallographic and magnetic properties of CaRu_(1-x)Mn_xO-3 (0≤x≤1.0) were investigated in detail by x-ray powder diffraction, magnetization, and magnetic Compton scattering measurements. The lattice parameters show considerable deviation from Vegard's law. Ferromagnetism appears at a relatively large Mn concentration (x≥0.2), and the magnetization and the Curie temperature have a maximum at a Mn content near x=0.7. The magnetic Compton scattering measurement revealed that Mn makes a dominant contribution to the magnetization and the Mn moment is antiparallel to the Ru moment, which is induced by Mn doping. The anomalous change in the unit cell volume and the occurrence of ferromagnetism were discussed on the basis of the mixed-valence model of Mn~(3+), Mn~(4+), Ru~(4+), and Ru~(5+) ions. The Mn-composition dependence of the spontaneous magnetization was explained semiquantitatively assuming (1) ferromagnetic coupling between Mn~(3+) and Mn~(4+) ions, (2) antiferromagnetic coupling between Ru~(5+) and Mn ions, and (3) the theoretical spin moments of Mn~(3+), Mn~(4+), and Ru~(5+). The ferromagnetic interaction between Mn~(3+) and Mn~(4+) ions seems to make a dominant contribution to the Curie temperature. The CaRu_(1-x)Mn_xO_3 system is considered to be a ferrimagnet induced through competition between the ferromagnetic interaction between Mn ions and the antiferromagnetic interaction between Ru~(5+) and Mn ions.
机译：通过X射线粉末衍射，磁化和磁康普顿散射测量详细研究了CaRu_（1-x）Mn_xO-3（0≤x≤1.0）的晶体学和磁性。晶格参数显示出与Vegard定律的相当大的偏差。铁磁性在相对较高的Mn浓度下出现（x≥0.2），并且在x = 0.7附近的Mn含量下磁化和居里温度达到最大值。磁康普顿散射测量表明，Mn对磁化起主要作用，并且Mn矩与Ru矩反平行，Ru矩是由Mn掺杂引起的。在Mn〜（3 +），Mn〜（4 +），Ru〜（4+）和Ru〜（）的混合价模型的基础上，讨论了晶胞体积的异常变化和铁磁性的发生。 5+）离子。假设（1）Mn〜（3+）与Mn〜（4+）离子之间的铁磁耦合，（2）Ru〜（5+）与Mn离子之间的反铁磁耦合， （3）Mn〜（3 +），Mn〜（4+）和Ru〜（5+）的理论自旋矩。 Mn〜（3+）和Mn〜（4+）离子之间的铁磁相互作用似乎对居里温度起主要作用。 CaRu_（1-x）Mn_xO_3系统被认为是通过Mn离子之间的铁磁相互作用与Ru〜（5+）和Mn离子之间的反铁磁相互作用的竞争而感应出的亚铁磁体。

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