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Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder compound UTe$$_{2}$$

常磁性重い電子系化合物UTe$$_{2}$$における低次元反強磁性揺らぎ

Knafo, W.*; Knebel, G.*; Steffens, P.*; 金子 耕士  ; Rosuel, A.*; Brison, J.-P.*; Flouquet, J.*; 青木 大*; Lapertot, G.*; Raymond, S.*

Knafo, W.*; Knebel, G.*; Steffens, P.*; Kaneko, Koji; Rosuel, A.*; Brison, J.-P.*; Flouquet, J.*; Aoki, Dai*; Lapertot, G.*; Raymond, S.*

Inelastic-neutron-scattering measurements were performed on a single crystal of the heavy-fermion paramagnet UTe$$_{2}$$ above its superconducting temperature. We confirm the presence of antiferromagnetic fluctuations with the incommensurate wave-vector $${bf K}_{1}$$ = (0, 0.57, 0). A quasielastic signal is found, whose momentum-transfer dependence is compatible with fluctuations of magnetic moments $$mu$$ $$||$$ ${bf a}$, with a sine-wave modulation of wave-vector $${bf K}_{1}$$ and in-phase moments on the nearest U atoms. Low dimensionality of the magnetic fluctuations, consequence of the ladder structure, is indicated by weak correlations along the direction ${bf c}$. These results constitute constraints for models of magnetically-mediated superconductivity in UTe$$_{2}$$.

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