2016年10月

Anomalous magnetic fluctuations in superconducting Sr2RuO4 revealed by Ru-101 nuclear spin-spin relaxation

PHYSICAL REVIEW B
• Masahiro Manago
• ,
• Takayoshi Yamanaka
• ,
• Kenji Ishida
• ,
• Zhiqiang Mao
• ,
• Yoshiteru Maeno

94
14

DOI
10.1103/PhysRevB.94.144511

AMER PHYSICAL SOC

We carried out Ru-101 nuclear quadrupole resonance (NQR) measurement on superconducting (SC) Sr2RuO4 under zero magnetic field (H = 0) and found that the nuclear spin-spin relaxation rate 1/T-2 is enhanced in the SC state. The 1/T-2 measurement in the SC state under H = 0 is effective for detecting slow magnetic fluctuations parallel to the quantized axis of the nuclear spin. Our results indicate that low-energy magnetic fluctuations perpendicular to the RuO2 plane emerge when the superconductivity sets in, which is consistent with the previous O-17-NQR result that the nuclear spin-lattice relaxation rate 1/T-1 of the in-plane O site exhibits anomalous behavior in the SC state. The enhancement of the magnetic fluctuations in the SC state is unusual and suggests that the fluctuations are related to the unconventional SC pairing. We suggest that this phenomenon is a consequence of the spin degrees of freedom of the spin-triplet pairing.

Web of Science ® 被引用回数 : 1

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.94.144511
Web of Science