Spin fluctuations in Sr$_2$ RuO$_4$ from polarized neutron scattering: implications for superconductivity - Archive ouverte HAL
Article Dans Une Revue Physical Review Letters Année : 2019

Spin fluctuations in Sr$_2$ RuO$_4$ from polarized neutron scattering: implications for superconductivity

Résumé

Triplet pairing in Sr$_2$RuO$_4$ 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 Sr$_2$RuO$_4$. 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 Sr$_2$RuO$_4$. 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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Dates et versions

hal-02364821 , version 1 (22-10-2024)

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P. Steffens, Yvan Sidis, J. Kulda, Z. Q. Mao, Y. Maeno, et al.. Spin fluctuations in Sr$_2$ RuO$_4$ from polarized neutron scattering: implications for superconductivity. Physical Review Letters, 2019, 122 (4), pp.047004. ⟨10.1103/PhysRevLett.122.047004⟩. ⟨hal-02364821⟩
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