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Evidence on the quantum critical point in EuTiO3–SrTiO3 solid solution
Physica B: Condensed Matter ( IF 2.8 ) Pub Date : 2021-07-03 , DOI: 10.1016/j.physb.2021.413225
R. Muralidharan 1 , K. Meera 2 , Y.H. Jeong 3
Affiliation  

EuTiO3 (ETO) and SrTiO3 (STO) are the two well-known analogous quantum paralelectric materials. In the present study, we synthesized Eu1-xSrxTiO3 for various values of x (0 < x < 1) by solid state reaction method. X-ray diffraction (XRD) measurement performed on the synthesized samples confirmed the cubic structure with tetragonal distortion for Eu rich samples. The phase purity of the synthesized samples was also confirmed by the X-ray measurements. X-ray photoelectron spectra were measured to show that the valence state of Eu is in 2+ states. The dielectric and magnetic properties of Eu1-xSrxTiO3 samples were systematically studied. The dielectric constant against temperature for pure ETO shows sudden drop at Neel temperature 5.3 K confirming the coupling between electric and magnetic polarization. The magnetization value remains constant below the Neel temperature for ETO and Eu0.8Sr0.2TiO3 samples while others show paramagnetic behavior. The magneto dielectric effect shows a huge value of around 5% at 2 K for ETO and abruptly drops by Sr doping. The proposed phase diagram with the magnetic and dielectric data of Eu1-xSrxTiO3 suggests a quantum critical point around the composition of Eu0.7Sr0.3TiO3.



中文翻译:

EuTiO 3 -SrTiO 3固溶体中量子临界点的证据

EuTiO 3 (ETO) 和 SrTiO 3 (STO) 是两种众所周知的类似量子平行电材料。在本研究中,我们通过固态反应法合成了不同 x (0 < x < 1) 值的Eu 1-x Sr x TiO 3。对合成样品进行的 X 射线衍射 (XRD) 测量证实了富含 Eu 样品的具有四方畸变的立方结构。X 射线测量也证实了合成样品的相纯度。测量 X 射线光电子能谱以显示 Eu 的价态处于 2+ 态。Eu 1-x Sr x TiO 3的介电和磁性能样品进行了系统研究。纯 ETO 的介电常数随温度的变化在 Neel 温度 5.3 K 时突然下降,证实了电极化和磁极化之间的耦合。ETO 和 Eu 0.8 Sr 0.2 TiO 3样品的磁化值在尼尔温度以下保持恒定,而其他样品则显示顺磁行为。ETO 的磁介电效应在 2 K 时显示出约 5% 的巨大值,并且由于 Sr 掺杂而突然下降。所提出的具有 Eu 1-x Sr x TiO 3的磁性和介电数据的相图表明 Eu 0.7 Sr 0.3 TiO 3的组成周围存在量子临界点.

更新日期:2021-07-15
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