Anisotropic superconducting gap in Sr2 RuO4 evidenced by a Ru NQR study

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

Research output: Contribution to journalConference articlepeer-review

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101Ru nuclear spin-lattice relaxation rate, 101(1/T1) was measured by Ru nuclear quadrupole resonance (NQR) under zero external field to investigate the superconducting gap property in the spin-triplet superconductor, Sr2 RuO4. T1 T = constant behavior was seen in the normal state below 4.2 K. In the superconducting state, 1/T1 in a recent sample with Tc ∼ 1.5 K shows a sharp decrease without a coherent peak just below Tc, followed by a T3 behavior down to 0.15 K, in contrast with the previous result that there exists a large residual density of states in low-Tc samples. This result indicates clearly that the large residual density of states in the low-Tc samples is an extrinsic effect, and that the superconducting gap in Sr2 RuO4 is a highly anisotropic nature with line nodes.

Original languageEnglish (US)
Pages (from-to)963-964
Number of pages2
JournalPhysica B: Condensed Matter
StatePublished - 2000
EventYamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Japan
Duration: Aug 24 1999Aug 28 1999

All Science Journal Classification (ASJC) codes

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


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