arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2104.09873cond-mat.mtrl-scicond-mat.str-el
收藏

RENiO3单晶(RE = Nd、Sm、Gd、Dy、Y、Ho、Er、Lu)在2000巴氧气压力下由熔融盐生长

RENiO3 single crystals (RE = Nd, Sm, Gd, Dy, Y, Ho, Er, Lu) grown from molten salts under 2000 bar oxygen-gas pressure

Y. Maximilian Klein, Mirosław Kozłowski, Anthony Linden, Philippe Lacorre, Marisa Medarde, Dariusz J. Gawryluk

摘要:

具有高度关联电子的过渡金属氧化物的电子性质在现代凝聚态物理和化学中具有核心重要性,这既是因为它们的基本科学兴趣,也是因为它们在先进电子应用中的潜力。然而,具有定制性质的材料的设计受到对其结构-性质关系的有限理解的限制,这些关系在局部电子逐渐移动的区域附近特别复杂。RENiO 3钙钛矿,其特征在于存在自发的金属到绝缘体的转变,是理论研究中最广泛使用的模型材料之一。然而,验证理论预测所需的关键实验信息仍然缺乏,因为它们具有挑战性的高压合成,这阻止了迄今为止具有不同于La,Pr和Nd的RE的相当大的大块单晶的生长。本文报道了在2000 bar氧气压力下,在温度梯度下,从熔盐中首次成功地生长出RE = Nd,Sm,Gd,Dy,Y,Ho,Er和Lu单晶,其尺寸可达~75 μm。晶体显示规则的棱柱形状与平面,其晶体结构,金属-绝缘体和反铁磁顺序转变温度与以前报道的多晶样品获得的值非常一致。这种晶体的可用性为迄今为止不可能进行的测量开辟了道路。这将有助于更好地理解具有高度相关电子的材料的迷人特性,并指导未来的努力,以设计具有定制功能特性的过渡金属氧化物。

英文摘要:

The electronic properties of transition-metal oxides with highly correlated electrons are of central importance in modern condensed matter physics and chemistry, both for their fundamental scientific interest, and for their potential for advanced electronic applications. The design of materials with tailored properties has been, however, restricted by the limited understanding of their structure-property relationships, which are particularly complex in the proximity of the regime where localized electrons become gradually mobile. RENiO3 perovskites, characterized by the presence of spontaneous metal to insulator transitions, are one of the most widely used model materials for the investigation of this region in theoretical studies. However, crucial experimental information needed to validate theoretical predictions is still lacking due to their challenging high-pressure synthesis, which has prevented to date the growth of sizable bulk single crystals with RE different than La, Pr and Nd. Here we report the first successful growth of single crystals with RE = Nd, Sm, Gd, Dy, Y, Ho, Er and Lu and sizes up to ~75 μm, grown from molten salts in temperature gradient under 2000 bar oxygen gas pressure. The crystals display regular prismatic shapes with flat facets, and their crystal structures, metal-insulator and antiferromagnetic order transition temperatures are in excellent agreement with previously reported values obtained from polycrystalline samples. The availability of such crystals opens access to measurements that have hitherto been impossible to conduct. This should contribute to a better understanding of the fascinating properties of materials with highly correlated electrons, and guide future efforts to engineer transition metal oxides with tailored functional properties.

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。

↑