# Spin gap and L modulated intensity at the low-energy incommensurate magnetic fluctuations in the superconducting state of Sr2RuO4

## TL;DR

This study combines neutron scattering and RPA calculations to explore low-energy magnetic fluctuations in Sr2RuO4, revealing a spin gap and L-modulated intensity that suggest horizontal line nodes in the superconducting gaps.

## Contribution

It provides new experimental and theoretical insights into the magnetic fluctuations and gap structure of Sr2RuO4 in the superconducting state.

## Key findings

- Observation of a spin gap at the incommensurate wave vector below Tc
- L modulated intensity of magnetic fluctuations in the superconducting state
- Indication of horizontal line nodes in the superconducting gaps

## Abstract

Low-energy incommensurate (IC) magnetic fluctuations in the multiband superconductor Sr$_2$RuO$_4$ is investigated by high-resolution inelastic neutron scattering measurements and random phase approximation (RPA) calculations. Below $T_\text{c}$, the substantial spin gap is observed at $\mathbf{Q}_\text{IC}=(0.3, 0.3, L)$ where the quasi-one-dimensional $\alpha$ and $\beta$ sheets consisting of the Fermi surfaces are in good nesting conditions. $L$ modulated intensity of the low-energy IC magnetic fluctuations and our RPA calculations indicate that the superconducting gaps regarding the $\alpha$ and $\beta$ sheets have the horizontal line nodes.

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Source: https://tomesphere.com/paper/1904.01234