Feedback of superconductivity on the magnetic excitation spectrum of UTe$_{2}$
2021
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 $\bf{k_1}$=(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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