TY - JOUR
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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U2 - 10.1103/PhysRevLett.84.5387
DO - 10.1103/PhysRevLett.84.5387
M3 - Article
AN - SCOPUS:0000300940
SN - 0031-9007
VL - 84
SP - 5387
EP - 5390
JO - Physical review letters
JF - Physical review letters
IS - 23
ER -