Feedback of Superconductivity on the Magnetic Excitation Spectrum of UTe2
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN(2021)
摘要
We investigate the spin dynamics in the superconducting phase of UTe2 by triple-axis inelastic neutron scattering on a single crystal. At the wave-vector 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 approximate to 1 meV. The low dimensional nature and the a-axis polarization of the fluctuations, that characterise the normal state, are essentially maintained below the superconducting transition. The high ratio Omega/k(B)T(sc) approximate to 7.2 contrasts with the most common behaviour in heavy fermion superconductors.
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关键词
superconductivity,magnetic excitation spectrum
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