Observation of transient lattice disorder at the onset of multiferroic ordering in Eu_(1-x)Ho_xMnO_3 by Raman spectroscopy

S. Elsasser; A. A. Mukhin; A. M. Balbashov; J. Geurts

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Observation of transient lattice disorder at the onset of multiferroic ordering in Eu_(1-x)Ho_xMnO_3 by Raman spectroscopy

机译：通过拉曼光谱观察Eu_（1-x）Ho_xMnO_3中多铁性有序出现时的瞬时晶格紊乱

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The orthorhombic rare-earth manganate Eu_(1-x)Ho_xMnO_3 (x ≥ 0.15) exhibits multiferroism below T_(MF) ~ 25 K, with a static electric polarization caused by a cycloidal spin order. We observe transient disorder effects in the crystal lattice in a very narrow temperature interval at the onset of the multiferroic ordering. This disorder manifests itself in a distinct transitory violation of the symmetry selection rules for lattice vibration modes in Raman spectroscopy: polarized Raman spectra show a clear increase of the intensity of symmetry-forbidden phonon modes. Possible scenarios of transient disorder in a narrow temperature range are discussed, with special reference to the development of 90° domain walls in Eu_(1-x)Ho_xMnO_3, which are associated with the onset of a spontaneous reorientation of the spin cycloids with decreasing temperature.

机译：斜方晶系稀土锰酸盐Eu_（1-x）Ho_xMnO_3（x≥0.15）在T_（MF）〜25 K以下表现出多铁性，并由于摆线旋转次序而引起静电极化。我们观察到在多铁性有序出现时，在非常窄的温度范围内晶格中的瞬态无序效应。这种无序现象表现为明显的暂时违反了拉曼光谱中晶格振动模式的对称选择规则：极化拉曼光谱显示了对称禁止声子模式强度的明显增加。讨论了在窄温度范围内可能出现的瞬态无序情况，并特别参考了Eu_（1-x）Ho_xMnO_3中90°畴壁的发展，这与温度降低时自旋摆线的自发重新取向有关。

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《Physical review. B, Condensed Matter And Materals Physics》 |2018年第22期|224307.1-224307.5|共5页
作者
S. Elsasser; A. A. Mukhin; A. M. Balbashov; J. Geurts;
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Physikalisches Institut (EP3), Universitdt Wurzburg, 97074 Wuerzburg, Germany;

Prokhorov General Physics Institute. Russian Academy of Sciences, Moscow 119991, Russia;

Moscow Power Engineering Institute (Technical University), ul. Krasnokazarmennaya 14. Moscow 111250, Russia;

Physikalisches Institut (EP3), Universitdt Wurzburg, 97074 Wuerzburg, Germany;

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1. Erratum: Observation of transient lattice disorder at the onset of multiferroic ordering in Eu_(1-x)Ho_xMnO_3, by Raman spectroscopy [Phys. Rev. B 97, 224307 (2018)] [J] . Elsasser S., Mukhin A. A., Balbashov A. M., Physical review. B, Condensed Matter And Materals Physics . 2018,第17期

机译：勘误：通过拉曼光谱法观察Eu_（1-x）Ho_xMnO_3中多铁性有序出现时的瞬时晶格紊乱[Phys。 B 97，224307（2018）版]
2. Lattice dynamics and spin-phonon coupling in orthorhombic Eu_(1-x)Ho_xMnO_3 (x ≤ 0.3) studied by Raman spectroscopy [J] . S. Elsaesser, J. Geurts, A. A. Mukhin, Physical Review. B, Condensed Matter . 2016,第5期

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Observation of transient lattice disorder at the onset of multiferroic ordering in Eu_(1-x)Ho_xMnO_3 by Raman spectroscopy

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