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arXiv 1808.05855cond-mat.supr-con
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极化中子散射引起的Sr2RuO4自旋涨落:对超导性的影响

Spin fluctuations in Sr2RuO4 from polarized neutron scattering: implications for superconductivity

P. Steffens, Y. Sidis, J. Kulda, Z. Q. Mao, Y. Maeno, I. I. Mazin, M. Braden

摘要:

Sr_2RuO_4中的三重态配对最初是基于强铁磁自旋涨落的假设提出的。利用极化非弹性中子散射,我们准确地确定了Sr2RuO4自旋涨落的全谱。除了充分研究的无公度磁波动,我们发现一个相当大的准铁磁信号,定量与所有宏观和微观探针一致。我们使用这个结果来解决磁驱动的三重态超导Sr2RuO4的可能性。我们的结论是,即使准铁磁信号比以前预期的更强,更尖锐,自旋波动本身是不足以产生一个三重态加强需要额外的相互作用或替代配对的情况。

英文摘要:

Triplet pairing in Sr2RuO4 was initially suggested based on the hypothesis of strong ferromagnetic spin fluctuations. Using polarized inelastic neutron scattering, we accurately determine the full spectrum of spin fluctuations in Sr2RuO4. Besides the well-studied incommensurate magnetic fluctuations we do find a sizeable quasiferromagnetic signal, quantitatively consistent with all macroscopic and microscopic probes. We use this result to address the possibility of magnetically-driven triplet superconductivity in Sr2RuO4. We conclude that, even though the quasiferromagnetic signal is stronger and sharper than previously anticipated, spin fluctuations alone are not enough to generate a triplet state strengthening the need for additional interactions or an alternative pairing scenario.

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