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arXiv 2103.04742cond-mat.mtrl-scicond-mat.other
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磁场驱动下EuTiO $_3$的新型相变

Magnetic field driven novel phase transitions in EuTiO$_3$

P. Pappas, M. Calamiotou, M. Polentarutti, G Bais, A. Bussmann-Holder, E. Liarokapis

摘要:

在Elettra同步辐射装置上,利用粉末XRD研究了100- 300 K温度范围内外加静态磁场(高达480 mT)对EuTiO $_3$(ETO)多晶样品结构性质的影响。虽然在此磁场范围内立方到四元结构相变温度几乎不受影响,但在两个特征温度(~ 200 K和250 K)出现显著的晶格效应,这在临界阈值磁场下变得更加明显。在~ 200 K的磁致伸缩的符号的变化被检测到归因于修改的局部磁性从固有的铁磁性到固有的反铁磁性。这些数据清楚地表明,强的自旋-晶格相互作用也控制ETO的高温相,并触发磁畴形成和新的相变的出现

英文摘要:

The influence of an external static magnetic field (up to 480 mT)on the structural properties of EuTiO$_3$ (ETO) polycrystalline samples was examined by powder XRD at the Elettra synchrotron facilities in the temperature range 100-300K. While the cubic to tetragonal structural phase transition temperature in this magnetic field range remains almost unaffected, significant lattice effects appear at two characteristic temperatures (~200K and 250K), which becomes more pronounced at a critical threshold magnetic field. At ~200K a change in the sign of the magnetostriction is detected attributed to a modification of the local magnetic properties from intrinsic ferromagnetism to intrinsic antiferromagnetism. These data are a clear indication that strong spin-lattice interactions govern also the high temperature phase of ETO and trigger the appearance of magnetic domain formation and novel phase transitions

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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