NMR Evidence for Coexistence of Superconductivity and Ferromagnetic Component in Magnetic Superconductor RuSr2YCu2O8: R99,101u and C63u NMR

作     者：Y. Tokunaga H. Kotegawa K. Ishida Y. Kitaoka H. Takagiwa J. Akimitsu 

作者机构：Department of Physical Science Graduate School of Engineering Science Osaka University Toyonaka Osaka 560-8531 Japan Core Research for Evolutional Science and Technology (CREST) of the Japan Science and Technology Corporation (JST) Department of Physics Aoyama-Gakuin University Setagaya-ku Tokyo 157-8572 Japan 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2001年第86卷第25期

页      面：5767-5767页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Superconducting materials 

摘      要：From Ru- and Cu-NMR studies, we present evidence for coexistence of superconductivity and ferromagnetism in a cuprate superconductor RuSr2YCu2O8 (RuY1212). The observation of a large enhancement of a radio-frequency field for the Ru-NMR signal at zero field reveals the existence of a ferromagnetic (FM) component in the ordered RuO2 plane below a Curie temperature of TM=150K. Just below the onset temperature of superconductivity Tconset=45K, a remarkable decrease of the nuclear spin-lattice relaxation rate 1/T1 was observed within the ordered RuO2 plane as well as the CuO2 plane, revealing that the superconducting gap coexists with the FM component in the RuO2 plane on a microscopic scale. In addition, from the observation of a sharp peak in 101(1/T1) at Tczero∼23K where the resistivity becomes zero, we suggest that the motion of self-induced vortices originating from fluctuations of the FM component induces the resistivity between Tconset and Tczero in RuY1212.