Coexistence of Ferromagnetism and Superconductivity in EuSr2 Ru1-x Nbx Cu2 O8
FANG Ming-Bao1 , FANG Ming-Hu2 , XU Zheng1 , JIAO Zheng-Kuan2
1 Department of Materials Science and Technology, Tongji University, Shanghai 200092
2 Department of Physics, Zhejiang University, Hangzhou 310027
Coexistence of Ferromagnetism and Superconductivity in EuSr2 Ru1-x Nbx Cu2 O8
FANG Ming-Bao1 ;FANG Ming-Hu2 ;XU Zheng1 ;JIAO Zheng-Kuan2
1 Department of Materials Science and Technology, Tongji University, Shanghai 200092
2 Department of Physics, Zhejiang University, Hangzhou 310027
关键词 ：
74.70.-b ,
74.72.-h ,
75.60.-d
Abstract ： The structural, magnetic and transport properties of2 Ru1-x Nbx Cu2 O8 (x = 0, 0.1, 0.2 and 0.5) samples have been investigated by means of x-ray diffraction, magnetization and resistance measurements. It is found that the EuSr2 Ru1-x Nbx Cu2 O8 compound exhibits a ferromagnetic order of the Ru moments below the Curie temperature 130.19 K, and becomes superconducting at a much lower critical temperature of 10 K. The experimental observation that partial substitution of Nb for Ru in this system results in the decrease of the Curie temperature further supports the idea that the ferromagnetic order involves only Ru moments in this compound. We suggest that the decrease of the superconducting critical temperature Tc due to the partial substitution of Nb for Ru originates from the decrease of the carrier concentration in the CuO2 plane because of Nb existing always in the Nb5+ valance state while Ru is in a mixted valance state between Ru4+ and Ru5+ . The coexistence of ferromagnetism and superconductivity is also discussed.
Key words ：
74.70.-b
74.72.-h
75.60.-d
出版日期: 2001-07-01
:
74.70.-b
(Superconducting materials other than cuprates)
74.72.-h
(Cuprate superconductors)
75.60.-d
(Domain effects, magnetization curves, and hysteresis)
引用本文:
FANG Ming-Bao;FANG Ming-Hu;XU Zheng;JIAO Zheng-Kuan. Coexistence of Ferromagnetism and Superconductivity in EuSr2 Ru1-x Nbx Cu2 O8 [J]. 中国物理快报, 2001, 18(7): 963-966.
2 Ru1-x Nbx Cu2 O8 . Chin. Phys. Lett., 2001, 18(7): 963-966.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2001/V18/I7/963
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2001, Vol. 18 
