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

doi:10.1103/PhysRevLett.84.5387

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

Research output: Contribution to journal › Article › peer-review

180 Scopus citations

Abstract

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 T_c1.5K 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 T_c, 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 language	English (US)
Pages (from-to)	5387-5390
Number of pages	4
Journal	Physical review letters
Volume	84
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.84.5387
State	Published - 2000

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.84.5387

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

abstract = "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.",

author = "K. Ishida and H. Mukuda and Y. Kitaoka and Mao, \{Z. Q.\} and Y. Mori and Y. Maeno",

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T1 - Anisotropic superconducting gap in the spin-triplet superconductor Sr2RuO4

T2 - Evidence from a Ru-NQR study

AU - Ishida, K.

AU - Mukuda, H.

AU - Kitaoka, Y.

AU - Mao, Z. Q.

AU - Mori, Y.

AU - Maeno, Y.

PY - 2000

Y1 - 2000

N2 - 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.

AB - 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.

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JO - Physical review letters

JF - Physical review letters

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

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