Spin Fluctuations in Sr2RuO4 from Polarized Neutron Scattering: Implications for Superconductivity

被引：55

作者：

Steffens, P. ^{[1
,2
]}

Sidis, Y. ^{[3
]}

Kulda, J. ^{[2
]}

Mao, Z. Q. ^{[4
,5
,6
]}

Maeno, Y. ^{[4
]}

Mazin, I. I. ^{[7
]}

Braden, M. ^{[1
]}

机构：

[1] Univ Cologne, Phys Inst 2, Zulpicher Str 77, D-50937 Cologne, Germany

[2] Inst Laue Langevin, 71 Ave Martyrs, F-38000 Grenoble, France

[3] CEA, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[4] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan

[5] Tulane Univ, Dept Phys, New Orleans, LA 70118 USA

[6] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA

[7] Naval Res Lab, Code 6393, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 04期

基金：

日本学术振兴会;

关键词：

TRIPLET SUPERCONDUCTIVITY; MAGNETISM; NMR; MECHANISM;

D O I：

10.1103/PhysRevLett.122.047004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 sizable 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.

引用

页数：6

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