利用光学浮区法制备了自旋梯子化合物Sr14-xCaxCu24O41 (SCCO)系列单晶样品,研究了氧气压对晶体生长的影响和制备条件对晶体性质的影响程度.发现在常压氧气氛下可以制备出Ca含量x小于8的大块高质量的SCCO晶体,但更高Ca含量的样品仍然必须在高压氧气氛下(0.9 MPa)下进行.采用XRD,EDX能谱和电阻率测量实验手段对不同条件制备的SCCO单晶样品进行的分析测试表明,不同氧气压制备出的SCCO单晶样品的性质差别较小,但是高压氧气氛更有利于高Ca含量样品的晶体生长.
Spin ladder compounds Sr14-xCaxCu24O41 (SCCO) single crystals have been grown under different oxygen pressures by an optical floating-zone technique.The effects of oxygen pressure on the crystal growth and properties of SCCO were studied.The SCCO single crystals with x≤8 can be grown in a flowing oxygen atmosphere.But the growth of the SCCO compounds with higher Ca content (x＞8) needs higher pressure (0.9 MPa).The single crystals were characterized by means of XRD,EDX and resistivity measurement.High pressure is in favor of forming of higher Ca-doped SCCO single crystals.SCCO single crystals grown under different oxygen pressures have almost the same quality.
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