Anisotropic superconducting gap in the spin-triplet superconductor Sr2RuO4: Evidence from a Ru-NQR study

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

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We have investigated a gap structure in the spin-triplet superconductor Sr2RuO4 through the measurement of the 101Ru nuclear spin-lattice relaxation rate 101(1/T1) down to 0.09 K at zero magnetic field. In the superconducting state, 1/T1 in a high-quality sample with Tc1.5K exhibits a sharp decrease without the coherence peak, followed by a T3 behavior down to 0.15 K. This result is in marked contrast to the behavior observed below 0.4K in samples with lower Tc, where T1T is a constant. This behavior is demonstrated to be not intrinsic. We conclude that the gap structure in Sr2RuO4 is significantly anisotropic, consistent with line-node-like models.

Original languageEnglish (US)
Pages (from-to)5387-5390
Number of pages4
JournalPhysical Review Letters
Issue number23
StatePublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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