Using the laser diode floating zone method, single crystals of LaNiO₃, a nickel oxide with perovskite structure, have been successfully prepared under a high oxygen pressure of 4 MPa (40 bar). Single crystal x-ray diffraction indicates that the crystal structure is rhombohedral with an Ni–O–Ni bond angle of 165.3(5)°. The resistivity ρ below 30 K obeys the Fermi liquid behavior, expressed as ρ(T) = ρ₀ + AT² (ρ₀, A, and T being the residual resistivity, coefficient, and temperature, respectively) with ρ₀ less than 10 µΩ cm. The magnetic susceptibility is nearly independent of the temperature, though it shows a broad maximum around 200 K, which is similar to the results in recent studies using single crystals. In the Hall effect, the contribution of hole carriers to the electrical transport is manifested as a positive Hall coefficient. Analysis of the Hall resistivity using the two-carrier model has revealed that even though the majority carriers are electrons, the Hall coefficient is positive due to minority holes with a higher mobility. This study may shed a new light on the properties of a correlated metal, LaNiO₃.

中文翻译：

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激光二极管浮区法制备钙钛矿型镍酸镍LaNiO3单晶的磁性和电子性质

使用激光二极管浮区法，已成功在4 MPa（40 bar）的高氧气压下成功制备了具有钙钛矿结构的氧化镍LaNiO ₃单晶。单晶X射线衍射表明晶体结构为菱面体，Ni-O-Ni键角为165.3（5）°。电阻率ρ低于30K的服从费米液体行为，表示为ρ（Ť）= ρ ₀ + AT ²（ρ ₀，甲，和Ť作为剩余电阻，系数和温度，分别地）与ρ ₀小于10 µΩ cm。磁化率几乎与温度无关，尽管它在200 K附近显示出很大的最大值，这与最近使用单晶的研究结果相似。在霍尔效应中，空穴载流子对电传输的贡献表现为正霍尔系数。使用两个载流子模型对霍尔电阻率进行的分析表明，即使大多数载流子是电子，霍尔效应系数仍为正，这是由于少数空穴具有较高的迁移率。这项研究可能会为相关金属LaNiO ₃的性质提供新的启示。