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  • PACS. 74.72.Bk Y-based cuprates - 74.25.Ha Magnetic properties - 76.60.Cq Chemical and Knight shifts  (1)
  • PACS: 61.46.+w; 76.60.-k  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 13 (2000), S. 457-475 
    ISSN: 1434-6036
    Keywords: PACS. 74.72.Bk Y-based cuprates - 74.25.Ha Magnetic properties - 76.60.Cq Chemical and Knight shifts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present detailed data and analysis of the effects of Zn substitution on the planar Cu site in YBa2Cu3O6+x (YBCO6+x) as evidenced from our 89Y NMR measurements on oriented powders. For we find additional NMR lines which are associated with the Zn substitution. From our data on the intensities and temperature dependence of the shift, width, and spin-lattice relaxation rate of these resonances, we conclude that the spinless Zn 3d 10 state induces local moments on the near-neighbour (nn) Cu atoms. Additionally, we conjecture that the local moments actually extend to the farther Cu atoms with the magnetization alternating in sign at subsequent nn sites. We show that this analysis is compatible with ESR data taken on dilute Gd doped (on the Y site) and on neutron scattering data reported recently on Zn substituted YBCO6 + x. For optimally doped compounds 89Y nn resonances are not detected, but a large T-dependent contribution to the 89Y NMR linewidth is evidenced and is also attributed to the occurence of a weak induced local moment near the Zn. These results are compatible with macroscopic magnetic measurements performed on YBCO6 + x samples prepared specifically in order to minimize the content of impurity phases. We find significant differences between the present results on the underdoped YBCO6 + x samples and 27Al NMR data taken on Al3+ substituted on the Cu site in optimally doped La2CuO4. Further experimental work is needed to clarify the detailed evolution of the impurity induced magnetism with hole content in the cuprates.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 64 (1997), S. 289-293 
    ISSN: 1432-0630
    Keywords: PACS: 61.46.+w; 76.60.-k
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: \chem{Cs_{1}C_{60}} . The \isotope{13}{C} NMR spectrum allows, when the Magic Angle Spinning (MAS) technique is used, to get information about the electronic structure of this phase, which points out that the spin density is not uniformly distributed on the \chem{C_{60}} ball. An estimation of the strength of the quadrupolar effects on \isotope{133}{Cs} is then given, which shows that it is possible to analyse the \isotope{133}{Cs} spin-lattice relaxation time T_{1} in terms of magnetic effects. A comparison with the T_{1} of \isotope{13}{C} is then justified and allows us to point out the importance of low dimensional antiferromagnetic fluctuations in this compound. We also investigate the nature of the magnetic ground state in \chem{Cs_{1}C_{60}} : the broadening of the spectra states unambiguously its magnetic nature and a detailed analysis of their shape gives further indications on the antiferromagnetic nature of the magnetic order, which seems characterized by a large amount of disorder.
    Type of Medium: Electronic Resource
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