压力及高压增氧对La2-xSmxCuO4结构及输运性质的影响

吴云龙; 宋春梅; 熊玉峰; 李来风

doi:10.11858/gywlxb.2006.04.013

压力及高压增氧对La2-xSmxCuO4结构及输运性质的影响

doi: 10.11858/gywlxb.2006.04.013

1.
中国科学院理化技术研究所，北京 100080；
2.
中国科学院研究生院，北京 100039；
3.
遵义师范学院物理系，贵州遵义 563002；
4.
国家纳米科学研究中心，北京 100080

详细信息

通讯作者:
吴云龙

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出版历程
- 收稿日期: 2005-10-18
- 修回日期: 2006-01-01
- 发布日期: 2006-12-05

Structure Evolution and Transport Properties of La2-xSmxCuO4 at High Pressure

1.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China;
2.
Graduate School of Chinese Academy of Sciences, Beijing 100039, China;
3.
Department of Physics, Zunyi Normal College, Zunyi 563002, China;
4.
National Center for Nanoscience and Technology, Beijing 100080, China

More Information

Corresponding author: WU Yun-Long

摘要

摘要: 对常压、高压、高压增氧条件下合成的La2-xSmxCuO4（0x2.0）结构进行了研究。常压合成样品清晰地反应出样品由TT+TT相的变化，其中，T相：0x0.2；T+T相：0.2x1.0；T相：1.0x2.0。随着x的增加，晶胞参数呈现下降趋势。高压样品没有明显出现T+T相的过渡阶段，而高压增氧样品更表现为稳定的T相。并且高压、高压增氧样品比常压合成样品含有较多的缺陷。SEM照片显示高压和高压增氧样品比常压合成样品具有更高的质密度，而高氧压的过程也使晶粒变得粗糙和易碎。只有T相高氧压合成样品呈现金属性电阻行为，在x0.5时，低温下出现超导电性，并且与交流磁化率结果相吻合。
- T相 /
- T相 /
- 高压 /
- 高温超导 /
- R2CuO4
Abstract: The structure evolution and transport properties of La2-xSmxCuO4 synthesized both at atmosphere pressure and high pressure have been studied. The crystal structure changed from T phase to the T phase. Following treatment in high pressure of 6 GPa in 850 ℃, a slight modification in the lattice constants was observed. The results also showed that oxygen pressure tended to stabilize the T structure. The pressure caused the sample density increasing. The high oxygen pressure treatment for the T structure resulted in a drastic decrease of the resistivity at low temperature, indicating a superconductivity with Sm concentration0.5.
- T phase /
- T phase /
- structure evolution /
- high pressure /
- superconductivity

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参考文献(15)

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