Feedback of superconductivity on the magnetic excitation spectrum of UTe${}_2$

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 ${\mathbf{k}}_1$=(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 $\Omega$ $\approx$ 1 meV. The low dimensional nature and the the $a$-axis polarization of the fluctuations, that characterise the normal state, are essentially maintained below $T_{sc}$. The high ratio $\Omega /k_B{T}_{sc}$ $\approx$ 7.2 contrasts with the most common behaviour in heavy fermion superconductors.

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Cited by in corpus (18)

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• Field-induced tuning of the pairing state in a superconductor
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• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Electronic structure of UTe${}_2$ under pressure
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T