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

Masahiro Manago; Takayoshi Yamanaka; Kenji Ishida; Zhiqiang Mao; Yoshiteru Maeno

doi:10.1103/PhysRevB.94.144511

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

Masahiro Manago, Takayoshi Yamanaka, Kenji Ishida, Zhiqiang Mao, Yoshiteru Maeno

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Abstract

We carried out Ru101 nuclear quadrupole resonance (NQR) measurement on superconducting (SC) Sr ₂ RuO ₄ 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 RuO ₂ plane emerge when the superconductivity sets in, which is consistent with the previous O17-NQR result that the nuclear spin-lattice relaxation rate 1/T1 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.

Original language	English (US)
Article number	144511
Journal	Physical Review B
Volume	94
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.94.144511
State	Published - Oct 19 2016

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Anomalous magnetic fluctuations in superconducting Sr2RuO4 revealed by Ru 101 nuclear spin-spin relaxation",

abstract = " We carried out Ru101 nuclear quadrupole resonance (NQR) measurement on superconducting (SC) Sr 2 RuO 4 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 RuO 2 plane emerge when the superconductivity sets in, which is consistent with the previous O17-NQR result that the nuclear spin-lattice relaxation rate 1/T1 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.",

author = "Masahiro Manago and Takayoshi Yamanaka and Kenji Ishida and Zhiqiang Mao and Yoshiteru Maeno",

note = "Publisher Copyright: {\textcopyright} 2016 American Physical Society.",

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doi = "10.1103/PhysRevB.94.144511",

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T1 - Anomalous magnetic fluctuations in superconducting Sr2RuO4 revealed by Ru 101 nuclear spin-spin relaxation

AU - Manago, Masahiro

AU - Yamanaka, Takayoshi

AU - Ishida, Kenji

AU - Mao, Zhiqiang

AU - Maeno, Yoshiteru

PY - 2016/10/19

Y1 - 2016/10/19

N2 - We carried out Ru101 nuclear quadrupole resonance (NQR) measurement on superconducting (SC) Sr 2 RuO 4 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 RuO 2 plane emerge when the superconductivity sets in, which is consistent with the previous O17-NQR result that the nuclear spin-lattice relaxation rate 1/T1 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.

AB - We carried out Ru101 nuclear quadrupole resonance (NQR) measurement on superconducting (SC) Sr 2 RuO 4 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 RuO 2 plane emerge when the superconductivity sets in, which is consistent with the previous O17-NQR result that the nuclear spin-lattice relaxation rate 1/T1 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.

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

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