Coexistence of ferromagnetism and superconductivity in magnetic superconductor RuSr2YCu2O8 revealed by 63Cu-NMR

Y. Tokunaga; H. Kotegawa; K. Ishida; Y. Kitaoka; H. Takagiwa; J. Akimitsu

doi:10.1016/S0921-4534(01)00801-2

Coexistence of ferromagnetism and superconductivity in magnetic superconductor RuSr₂YCu₂O₈ revealed by ⁶³Cu-NMR

Y. Tokunaga, H. Kotegawa, K. Ishida, Y. Kitaoka, H. Takagiwa, J. Akimitsu

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

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 T_M 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 T_c^onset = 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.

Original language	English
Pages (from-to)	379-382
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	364-365
DOIs	https://doi.org/10.1016/S0921-4534(01)00801-2
Publication status	Published - Nov 2001

Keywords

Cu-NMR
Ferromagnetic superconductor
RuSrYCuO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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@article{e8738d6f5e044344ba350bdb51c48c47,

title = "Coexistence of ferromagnetism and superconductivity in magnetic superconductor RuSr2YCu2O8 revealed by 63Cu-NMR",

abstract = "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.",

keywords = "Cu-NMR, Ferromagnetic superconductor, RuSrYCuO",

author = "Y. Tokunaga and H. Kotegawa and K. Ishida and Y. Kitaoka and H. Takagiwa and J. Akimitsu",

note = "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. Copyright: Copyright 2007 Elsevier B.V., All rights reserved.",

year = "2001",

month = nov,

doi = "10.1016/S0921-4534(01)00801-2",

language = "English",

volume = "364-365",

pages = "379--382",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier",

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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. Copyright: Copyright 2007 Elsevier B.V., All rights reserved.

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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