Connection between f-electron correlations and magnetic excitations in UTe2

IF 5.4 1区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Quantum Materials Pub Date : 2025-01-04 DOI:10.1038/s41535-024-00720-9

Thomas Halloran, Peter Czajka, Gicela Saucedo Salas, Corey E. Frank, Chang-Jong Kang, J. A. Rodriguez-Rivera, Jakob Lass, Daniel G. Mazzone, Marc Janoschek, Gabriel Kotliar, Nicholas P. Butch

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Abstract

The detailed anisotropic dispersion of the low-temperature, low-energy magnetic excitations of the candidate spin-triplet superconductor UTe₂ is revealed using inelastic neutron scattering. The magnetic excitations emerge from the Brillouin zone boundary at the high symmetry Y and T points and disperse along the crystallographic \(\hat{b}\)-axis. In applied magnetic fields to at least μ₀H = 11 T along the \(\hat{c}-{\rm{axis}}\), the magnetism is found to be field-independent in the (hk0) plane. The scattering intensity is consistent with that expected from U³⁺/U⁴⁺ f-electron spins with preferential orientation along the crystallographic \(\hat{a}\)-axis, and a fluctuating magnetic moment of μ_eff=1.7(5) μ_B. We propose interband spin excitons arising from f-electron hybridization as a possible origin of the magnetic excitations in UTe₂.

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UTe2中f电子相关与磁激发的关系

利用非弹性中子散射，揭示了候选自旋三重态超导体UTe2的低温低能磁激发的详细各向异性色散。磁激发从高对称性的Y和T点的布里温区边界产生，并沿晶体学\(\hat{b}\) -轴分散。当沿\(\hat{c}-{\rm{axis}}\)方向施加的磁场至少为μ0H = 11t时，在（hk0）平面上，磁性与场无关。散射强度与U3+/U4+ f电子沿晶体学\(\hat{a}\) -轴优先取向自旋的散射强度一致，波动磁矩为μeff=1.7(5) μB。我们提出由f电子杂化产生的带间自旋激子可能是UTe2中磁激发的来源。

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来源期刊

npj Quantum Materials Materials Science-Electronic, Optical and Magnetic Materials

CiteScore

10.60

自引率

3.50%

发文量

107

审稿时长

6 weeks

期刊介绍： npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.