NMR Evidence for Coexistence of Superconductivity and Ferromagnetic Component in Magnetic Superconductor RuSr{sub 2}YCu{sub 2}O{sub 8} : {sup 99,101}Ru and {sup 63}Cu NMR
From Ru- and Cu-NMR studies, we present evidence for coexistence of superconductivity and ferromagnetism in a cuprate superconductor RuSr{sub 2}YCu {sub 2}O{sub 8} (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 RuO{sub 2} plane below a Curie temperature of T{sub M}=150 K . Just below the onset temperature of superconductivity T{sup onset}{sub c}=45 K , a remarkable decrease of the nuclear spin-lattice relaxation rate 1/T{sub 1} was observed within the ordered RuO{sub 2} plane as well as the CuO{sub 2} plane, revealing that the superconducting gap coexists with the FM component in the RuO{sub 2} plane on a microscopic scale. In addition, from the observation of a sharp peak in {sup 101}(1/T{sub 1}) at T{sup zero}{sub c}{similar_to}23 K 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 T{sup onset}{sub c} and T{sup zero}{sub c} in RuY1212.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40204686
- Journal Information:
- Physical Review Letters, Vol. 86, Issue 25; Other Information: DOI: 10.1103/PhysRevLett.86.5767; Othernumber: PRLTAO000086000025005767000001; 034125PRL; PBD: 18 Jun 2001; ISSN 0031-9007
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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