Abstract In the last few decades there has been growing interest in studying Mott insulators due to their ability to host novel quantum phenomena when the system is perturbed by various stimuli. Recently the antiferromagnetic Mott insulator Ca2RuO4 has received considerable attention due to superconductivity and metal-insulator transition induced by pressure and electric field respectively. Here we report the details of the synthesis of a novel systems made by Ca2RuO4 and Ru metal inclusions. Samples with lamellae, rods and globules of Ru embedded in Ca2RuO4 single crystals were successfully synthesized by floating zone technique with an excess of Ru in the starting material. The morphology and structural studies revealed a randomly orientated distribution of the shining Ru inclusions with an average size of few microns. Magnetic and electrical properties showed a behavior similar to the one observed in single crystals with the only Ca2RuO4 phase. We also measured the current-voltage characteristics of the whole Ca2RuO4–Ru system and of a single Ru rod by electric micro-contacts estimating the room temperature resistivity of the Ru embedded inclusions. This study shows that physical properties of Ca2RuO4–Ru metal system are related to the properties of the constituent phases, similarly to the case of Sr2RuO4–Ru metal.

中文翻译：

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Ca2RuO4-Ru 金属体系的浮区技术晶体生长

摘要 在过去的几十年里，人们对莫特绝缘体的研究兴趣日益浓厚，因为当系统受到各种刺激的干扰时，它们能够承载新的量子现象。最近，反铁磁莫特绝缘体 Ca2RuO4 因压力和电场分别引起的超导性和金属-绝缘体跃迁而受到广泛关注。在这里，我们报告了由 Ca2RuO4 和 Ru 金属夹杂物制成的新型系统的合成细节。通过浮区技术在起始材料中使用过量的 Ru 成功地合成了带有嵌入 Ca2RuO4 单晶的 Ru 的片状、棒状和球状样品。形态和结构研究揭示了平均尺寸为几微米的闪亮 Ru 夹杂物的随机取向分布。磁性和电学性质表现出类似于在具有唯一 Ca2RuO4 相的单晶中观察到的行为。我们还通过电微接触测量了整个 Ca2RuO4-Ru 系统和单个 Ru 棒的电流-电压特性，估计了 Ru 嵌入夹杂物的室温电阻率。该研究表明，Ca2RuO4-Ru 金属体系的物理性质与组成相的性质有关，类似于 Sr2RuO4-Ru 金属的情况。