Effect of structural distortion on ferrimagnetic order inLu1−xLxFe2O4(L=Yand Er;x=0.0, 0.1, and 0.5)
| Autor: | Sung Baek Kim, Jae Young Kim, Jinwon Jeong, Jinhwan Jeong, Beongki Cho, Han-Jin Noh, J. Y. Kim, Hojin Sung |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Physical Review B. 82 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.82.024423 |
| Popis: | We have studied the correlation between the structural distortion and the magnetic interaction change in the ferrimagnetic $(\text{Lu},L){\text{Fe}}_{2}{\text{O}}_{4}$ ($L=\text{Y}$ and Er) by using neutron powder diffraction and x-ray magnetic circular dichroism (XMCD). The Rietveld profile refinements revealed that the Y or Er substitution flattens the hexagonal unit cell of the system and asymmetrically distorts the bipyramidal ${\text{FeO}}_{5}$ cages with the increase in the substitution. Even in the presence of the Y or Er substitution, $\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}$ superlattices are formed by Fe-valence ordering, and the interlayer magnetic coupling behavior does not change very much. Meanwhile, the $\text{Fe}\text{ }2p$ XMCD spectra indicate that the ${\text{Fe}}^{3+}$ spins become frustrated as the substitution increases. These results support that the unquenched orbital moment of the ${\text{Fe}}^{2+}$ ions is the dominant factor for the giant magnetic anisotropy in ${\text{LuFe}}_{2}{\text{O}}_{4}$. |
| Databáze: | OpenAIRE |
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