TY - JOUR
T1 - Coexistence of ferromagnetism and superconductivity in magnetic superconductor RuSr2YCu2O8 revealed by 63Cu-NMR
AU - Tokunaga, Y.
AU - Kotegawa, H.
AU - Ishida, K.
AU - Kitaoka, Y.
AU - Takagiwa, H.
AU - Akimitsu, J.
N1 - Funding Information:
The authors would like to thank G.-q. Zheng, H. Mukuda, S. Nakatsuji, Y. Maeno, Y. Furukawa and K. Kumagai for valuable discussions. This work was partly supported by the COE Research (10CE2004) in a Grant-in-Aid for Scientific Research from the Ministry of Education, Sports, Science and Culture of Japan. One of authors (Y.T) have been supported by JSPS Research Fellowships for Young Scientists.
PY - 2001/11
Y1 - 2001/11
N2 - 63Cu-NMR measurement has been performed to investigate the coexistence of superconductivity and ferromagnetism in a hybrid ruthenium (Ru)-copper (Cu) oxide superconductor RuSr2YCu2O8 (RuY1212). Broadening of the Cu-NMR signal below TM demonstrates that Cu nuclei in CuO2 planes feel a dipolar field from ordered Ru moments in RuO2 planes. On the other hand, the opening of the SC gap is confirmed from the observation of a decrease in the nuclear spin-lattice relaxation rate, 631/T1, below Tconset = 45 K. These NMR results provide evidence that the superconductivity coexists with the (field induced) ferromagnetism at a microscopic scale. We also found that the T dependence and the magnitude of 1/T1T are quite similar to those in YBa2Cu3O7 (Y1237), indicative of the same spin-fluctuation character in both compounds. This suggests that the hole content in RuY1212 is comparable to that in Y1237.
AB - 63Cu-NMR measurement has been performed to investigate the coexistence of superconductivity and ferromagnetism in a hybrid ruthenium (Ru)-copper (Cu) oxide superconductor RuSr2YCu2O8 (RuY1212). Broadening of the Cu-NMR signal below TM demonstrates that Cu nuclei in CuO2 planes feel a dipolar field from ordered Ru moments in RuO2 planes. On the other hand, the opening of the SC gap is confirmed from the observation of a decrease in the nuclear spin-lattice relaxation rate, 631/T1, below Tconset = 45 K. These NMR results provide evidence that the superconductivity coexists with the (field induced) ferromagnetism at a microscopic scale. We also found that the T dependence and the magnitude of 1/T1T are quite similar to those in YBa2Cu3O7 (Y1237), indicative of the same spin-fluctuation character in both compounds. This suggests that the hole content in RuY1212 is comparable to that in Y1237.
KW - Cu-NMR
KW - Ferromagnetic superconductor
KW - RuSrYCuO
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U2 - 10.1016/S0921-4534(01)00801-2
DO - 10.1016/S0921-4534(01)00801-2
M3 - Article
AN - SCOPUS:18144440197
VL - 364-365
SP - 379
EP - 382
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
ER -