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Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder compound UTe2

W. Knafo1, G. Knebel2, P. Steffens3, K. Kaneko4,5, A. Rosuel2, J.-P. Brison2, J. Flouquet2, D. Aoki6, G. Lapertot2 et al.

S. Raymond7

  • 1Laboratoire National des Champs Magnétiques Intenses-EMFL, CNRS, Université Grenoble Alpes, INSA-T, Université Toulouse 3, 31400 Toulouse, France
  • 2Université Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, 38000 Grenoble, France
  • 3Institut Laue Langevin, 71 av des Martyrs, CS 20156, 38042 Grenoble, France
  • 4Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 5Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 6Institute for Materials Research, Tohoku University, Ibaraki 311-1313, Japan
  • 7Université Grenoble Alpes, CEA, IRIG, MEM, MDN, 38000 Grenoble, France

Phys. Rev. B 104, L100409 – Published 14 September, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L100409

Abstract

Inelastic-neutron-scattering measurements were performed on a single crystal of the heavy-fermion paramagnet UTe2 above its superconducting temperature. We confirm the presence of antiferromagnetic fluctuations with the incommensurate wave-vector k1=(0,0.57,0). A quasielastic signal is found, whose momentum-transfer dependence is compatible with fluctuations of magnetic moments μ∥a with a sine-wave modulation of wave-vector k1 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 c. These fluctuations saturate below the temperature T1*≃15K, in possible relation with anomalies observed in thermodynamic, electrical-transport, and nuclear-magnetic-resonance measurements. The absence or weakness of ferromagnetic fluctuations in our data collected at temperatures down to 2.1 K and energy transfers from 0.6 to 7.5 meV is emphasized. These results constitute constraints for models of magnetically mediated superconductivity in UTe2.

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