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Coexistence of ferromagnetism and superconductivity in Cu-rich lanthanum Cu-oxides |
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| Authors: | Bai-Ru Zhao Xiao-Li Dong Peng-Shun Luo Min Gao Zhong-Xian Zhao Lian-Mao Peng Yong-Ming Ni Xiang-Gang Qiu Satoshi Awaji Kazuo Watanabe Fei Wu Bo Xu Li-Hua Zhao F.C. Zhang |
| Affiliation: | (1) National Laboratory for Superconductivity, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080, PR China, CN;(2) Beijing Laboratory of Electron Microscopy, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, PR China, CN;(3) Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan, JP;(4) Department of Physics, Hunan University, Changsha 410082, PR China, CN;(5) Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221, USA and Department of Physics, Chinese University of Hong Kong, Shatin, Hong Kong, HK |
| Abstract: | We have measured the zero field and field cooled magnetization of the lightly oxygen doped Cu-rich La2CuO 4 + δ in a wide temperature range (5 K to 350 K). The data together with the evolution of the magnetic hysteresis loop suggest that the ferromagnetism with Curie temperature of 280 K coexists with superconductivity below the transition temperature ∼ 34 K. The coexistence occurs in the hole-rich clusters of size ? 150 nm, which are electronic phase separated from the hole-poor antiferromagnetic background. Received 17 October 2001 |
| Keywords: | PACS. 74.72.Dn La-based cuprates – 74.25.Ha Magnetic properties – 74.90.+n Other topics in superconductivity |
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