NMR and NQR studies on superconducting Sr2RuO4

Kenji Ishida, Hiroshi Murakawa, Hidekazu Mukuda, Yoshio Kitaoka, Z. Q. Mao, Yoshiteru Maeno

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14 Scopus citations

Abstract

We review our nuclear-magnetic resonance (NMR) and nuclear-quadrupole-resonance (NQR) studies in superconducting Sr2RuO4, which have been performed in order to investigate the gap structure and the pairing symmetry in the superconducting state and magnetic fluctuations in the normal state. The spin-lattice relaxation rate (1 / T1) of a high-quality sample with Tc ∼ 1.5 K shows a sharp decrease without a coherence peak just below Tc, followed by a T3 behavior down to 0.15 K. This result indicates that the superconducting gap in pure Sr2RuO4 is a highly anisotropic character with a line-node gap. The Knight shift, which is related to the spin susceptibility, is unchanged in the superconducting state irrespective of the direction of the applied fields and various magnitude of the field. This result strongly suggests that the superconducting pairs are in the spin-triplet state, and the spin direction of the triplet pairs is considered to be changed by small fields of several hundred Oe.

Original languageEnglish (US)
Pages (from-to)3108-3114
Number of pages7
JournalJournal of Physics and Chemistry of Solids
Volume69
Issue number12
DOIs
StatePublished - Dec 1 2008

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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