17O NMR probe of spin fluctuations in triplet superconductor Sr2RuO4

H. Mukuda, K. Ishida, Y. Kitaoka, K. Asayama, Z. Q. Mao, Y. Mori, Y. Maeno

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Abstract

From the 17O Knight shift measurements on O(1) in RuO2 planes and O(2) in SrO layers in Sr2RuO4 with Tc = 1.5 K, it is shown that the distribution of the spin density at the O(1) sites reflects two-dimensional electronic structure with most of its fraction on the in-plane pπ orbitals. From systematic measurements of the nuclear spin-lattice relaxation rate, T1-1, it is found that dynamical susceptibility is highly anisotropic in contrast to the uniform susceptibility being isotropic. Their in-plane components for the O(1) sites are almost independent of wavenumber although they are exchange-enhanced, whereas it is unexpected that the out-of-plane component being q dependent is pronouncedly enhanced by interlayer antiferromagnetic spin fluctuations below T* ∼ 130 K where the c-axis resistivity shows a metallic behavior. These novel characters of spin fluctuations are suggested to lead to discussions about a possible mechanism of spin-triplet p-wave superconductivity in Sr2RuO4.

Original languageEnglish (US)
Pages (from-to)944-946
Number of pages3
JournalPhysica B: Condensed Matter
Volume259-261
DOIs
StatePublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Mukuda, H., Ishida, K., Kitaoka, Y., Asayama, K., Mao, Z. Q., Mori, Y., & Maeno, Y. (1999). 17O NMR probe of spin fluctuations in triplet superconductor Sr2RuO4. Physica B: Condensed Matter, 259-261, 944-946. https://doi.org/10.1016/S0921-4526(98)01037-0