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<p>Single crystals of layered oxychalcogenide Sr<sub>2</sub><i>M</i>Cu<sub>2</sub>Se<sub>2</sub>O<sub>2</sub> (<i>M</i> = Co, Ni) have been successfully grown by the melt-solidification method. Thermal analysis and X-ray diffraction measurement results revealed that these compounds are congruent melting under a sealed environment similar to Sr<sub>2</sub>ZnCu<sub>2</sub>Se<sub>2</sub>O<sub>2</sub>, while melting points are slightly different. The plate-like single crystals on the order of mm<sup>2</sup> were obtained by melt solidification. The anisotropy of resistivity in Sr<sub>2</sub>CoCu<sub>2</sub>Se<sub>2</sub>O<sub>2</sub> showed that the resistivity in the <i>c</i>-axis direction was about 200 times higher than in the <i>a</i>(<i>b</i>)-axis direction, reflecting the two-dimensional crystal structure. These results indicate that there are&#xa0;several congruent melting layered mixed-anion compounds, even though they have complex crystal structures with multiple components. Thus, the single crystal growth method by melt-solidification under a sealed environment has the potential to be applied to other relative compounds.</p>

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Single crystal growth in series of layered oxyselenide Sr2MCu2Se2O2 (M = Co, Ni) by melt-solidification method

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Takahiro Kato,
  • Yuki Iwasa,
  • Yuui Yokota,
  • Shigeyuki Ishida,
  • Junichiro Kato,
  • Yutaro Mino,
  • S. Pavan Kumar Naik,
  • Takahiko Horiai,
  • Akira Yoshikawa,
  • Taichiro Nishio,
  • Hiroshi Eisaki,
  • Hiraku Ogino

摘要

Single crystals of layered oxychalcogenide Sr2MCu2Se2O2 (M = Co, Ni) have been successfully grown by the melt-solidification method. Thermal analysis and X-ray diffraction measurement results revealed that these compounds are congruent melting under a sealed environment similar to Sr2ZnCu2Se2O2, while melting points are slightly different. The plate-like single crystals on the order of mm2 were obtained by melt solidification. The anisotropy of resistivity in Sr2CoCu2Se2O2 showed that the resistivity in the c-axis direction was about 200 times higher than in the a(b)-axis direction, reflecting the two-dimensional crystal structure. These results indicate that there are several congruent melting layered mixed-anion compounds, even though they have complex crystal structures with multiple components. Thus, the single crystal growth method by melt-solidification under a sealed environment has the potential to be applied to other relative compounds.