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

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

Research output: Contribution to journalArticle

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 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 Tc 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 languageEnglish
Pages (from-to)379-382
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume364-365
DOIs
Publication statusPublished - Nov 2001
Externally publishedYes

Fingerprint

Ferromagnetism
Superconductivity
ferromagnetism
Superconducting materials
Ruthenium
superconductivity
Nuclear magnetic resonance
nuclear magnetic resonance
ruthenium
Spin fluctuations
Oxide superconductors
Spin-lattice relaxation
spin-lattice relaxation
nuclear spin
Copper
moments
copper
nuclei
oxides

Keywords

  • Cu-NMR
  • Ferromagnetic superconductor
  • RuSrYCuO

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Coexistence of ferromagnetism and superconductivity in magnetic superconductor RuSr2YCu2O8 revealed by 63Cu-NMR. / Tokunaga, Y.; Kotegawa, H.; Ishida, K.; Kitaoka, Y.; Takagiwa, H.; Akimitsu, Jun.

In: Physica C: Superconductivity and its Applications, Vol. 364-365, 11.2001, p. 379-382.

Research output: Contribution to journalArticle

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AU - Kotegawa, H.

AU - Ishida, K.

AU - Kitaoka, Y.

AU - Takagiwa, H.

AU - Akimitsu, Jun

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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 Tc 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.

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 Tc 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.

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