Feedback of superconductivity on the magnetic excitation spectrum of UTe$_2$ - Archive ouverte HAL Access content directly
Journal Articles Journal of the Physical Society of Japan Year : 2021

## Feedback of superconductivity on the magnetic excitation spectrum of UTe$_2$

Stéphane Raymond
William Knafo
Georg Knebel
Koji Kaneko
Jean-Pascal Brison
Dai Aoki
Gérard Lapertot

#### Abstract

We investigate the spin dynamics in the superconducting phase of UTe$_2$ by triple-axis inelastic neutron scattering on a single crystal sample. At the wave-vector k1=(0, 0.57, 0), where the normal state antiferromagnetic correlations are peaked, a modification of the excitation spectrum is evidenced, on crossing the superconducting transition, with a reduction of the relaxation rate together with the development of an inelastic peak at Ω ≈ 1 meV. The low dimensional nature and the the a-axis polarization of the fluctuations, that characterise the normal state, are essentially maintained below Tsc. The high ratio Ω/kBTsc ≈ 7.2 contrasts with the most common behaviour in heavy fermion superconductors.

### Dates and versions

hal-03519759 , version 1 (12-01-2022)

### Identifiers

• HAL Id : hal-03519759 , version 1
• DOI :

### Cite

Stéphane Raymond, William Knafo, Georg Knebel, Koji Kaneko, Jean-Pascal Brison, et al.. Feedback of superconductivity on the magnetic excitation spectrum of UTe$_2$. Journal of the Physical Society of Japan, 2021, 90 (11), ⟨10.7566/JPSJ.90.113706⟩. ⟨hal-03519759⟩

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