Single-Crystal Growth of a Perovskite Ruthenate SrRuO3 by the Floating-Zone Method

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• 作者：Naoki Kikugawa ; Ryan Baumbach ; James S. Brooks ; Taichi Terashima ; Shinya Uji ; Yoshiteru Maeno
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：November 4, 2015
• 年：2015
• 卷：15
• 期：11
• 页码：5573-5577
• 全文大小：357K
• ISSN：1528-7505

文摘

We report single-crystal growth of a perovskite ruthenate SrRuO₃ by the floating-zone method using an infrared image furnace. By employing a cold trap for the growth, we prevented the evaporated RuO₂ from coating the inner surface of a quartz tube and were thereby able to maintain a stable molten zone during the growth. Powder X-ray and Laue diffraction measurements confirmed the quality of the grown single crystal. The crystal was cut into a 1.4 mm 脳 1.4 mm 脳 3.0 mm rectangle that was characterized by magnetic susceptibility, magnetization, and specific heat measurements. The crystal showed a ferromagnetic transition with a Curie temperature of 163.5 K, and the coercive field was as low as 0.004 T. The residual resistivity was 1.05 渭惟 cm, corresponding to a residual resistivity ratio of 192. These results indicate that the grown crystal is high-quality. Electrical resistivity measurements show temperature-squared behavior, revealing that a Fermi-liquid-like electron鈥揺lectron scattering is dominant. Together with a large electronic specific heat coefficient with 30 mJ K^鈥? mol^鈥?, we confirm that the ferromagnetic SrRuO₃ is a strongly correlated material.