高压增氧T相 R2CuO4+（R=Nd~Tm）低温磁性研究

吴云龙; 熊玉峰; 戴闻; 李克强; 姚玉书; 金铎

doi:10.11858/gywlxb.2004.04.009

高压增氧T相 R2CuO4+（R=Nd~Tm）低温磁性研究

doi: 10.11858/gywlxb.2004.04.009

1.
中国科学院理化技术研究所，北京 100080；
2.
中国科学院物理研究所，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: 2003-12-25
- 修回日期: 2004-05-08
- 发布日期: 2004-12-05

Magnetic Behavior of Oxygen-Doped T-R2CuO4 (R=Nd~Tm) at Low Temperature

1.
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China;
2.
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

More Information

Corresponding author: WU Yun-Long

摘要

摘要: T相R2CuO4稀土铜氧化合物由于尺度效应而产生弱铁磁性行为已经被人们关注，报导了通过高温高氧压（6 GPa，1 000 ℃）合成稀土T相R2CuO4（R＝Nd，Sm，Eu，Gd，Tb，Dy，Ho，Er和Tm）化合物的结构和磁学性能。磁化率曲线显示，在低温下所有的高压增氧R2CuO4样品都出现新的低温弱铁磁性反常行为，转变温度在28 K附近。新的低温弱铁磁性行为是由于CuO2面上微量氧空穴的掺入，使处于反铁磁有序CuO2面形成局域化的铁磁性团簇造成。实验证明新发现的低温弱铁磁性行为与尺度效应产生弱铁磁性行为属于完全不同的物理机制。结果还预示T相R2CuO4稀土铜氧化合物很难通过空穴掺杂而实现超导。
- 高温超导 /
- R2CuO4 /
- 弱铁磁性 /
- 高压
Abstract: The weak ferromagnetic behavior arises from the size effects, which gives rise to the distortion of the T-R2CuO4 structure. In this paper, we study magnetic properties on rare-earth cuprates, R2CuO4 (R=Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er and Tm), synthesized under high oxygen pressure (6 GPa) at elevated-temperature. The magnetic susceptibility measurements show a new weak-magnetic component near a characteristic temperature of 28 K. Appearances of the low temperature weak-magnetism are independent of the rare-earth components and are a common behavior of all oxygen-doped T-R2CuO4 cuprates. We argue that (1) the weak ferromagnetic behavior occurred near 28 K couldn't be attributed to the size effects, but to the formation of ferromagnetic clusters in CuO2 planes caused by the oxygendoping under high pressure; (2) superconductivity and weak ferromagnetism seem to be exclusive in T-R2CuO4 compounds, i. e., the ferromagnetic clusters in CuO2 planes seems to be incompatible with superconductivity in these system.
- high temperature superconductor /
- R2CuO4 /
- weak ferromagnetism /
- high-pressure synthesis

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参考文献(19)

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