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<p>The detailed anisotropic dispersion of the low-temperature, low-energy magnetic excitations of the candidate spin-triplet superconductor UTe<sub>2</sub> is revealed using inelastic neutron scattering. The magnetic excitations emerge from the Brillouin zone boundary at the high symmetry <i>Y</i> and <i>T</i> points and disperse along the crystallographic <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41535_2024_720_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(\hat{b}\)</EquationSource> <EquationSource Format="MATHML"><math> <mover accent="true"> <mrow> <mi>b</mi> </mrow> <mrow> <mo>̂</mo> </mrow> </mover> </math></EquationSource> </InlineEquation>-axis. In applied magnetic fields to at least <i>μ</i><sub>0</sub><i>H</i> = 11 T along the <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41535_2024_720_Article_IEq2.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="57" /> </InlineMediaObject> <EquationSource Format="TEX">\(\hat{c}-{\rm{axis}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mover accent="true"> <mrow> <mi>c</mi> </mrow> <mrow> <mo>̂</mo> </mrow> </mover> <mo>−</mo> <mi mathvariant="normal">axis</mi> </mrow> </math></EquationSource> </InlineEquation>, the magnetism is found to be field-independent in the (<i>h</i><i>k</i>0) plane. The scattering intensity is consistent with that expected from U<sup>3+</sup>/U<sup>4+</sup> <i>f</i>-electron spins with preferential orientation along the crystallographic <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41535_2024_720_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="12" /> </InlineMediaObject> <EquationSource Format="TEX">\(\hat{a}\)</EquationSource> <EquationSource Format="MATHML"><math> <mover accent="true"> <mrow> <mi>a</mi> </mrow> <mrow> <mo>̂</mo> </mrow> </mover> </math></EquationSource> </InlineEquation>-axis, and a fluctuating magnetic moment of <i>μ</i><sub><i>e</i><i>f</i><i>f</i></sub>=1.7(5) <i>μ</i><sub><i>B</i></sub>. We propose interband spin excitons arising from <i>f</i>-electron hybridization as a possible origin of the magnetic excitations in UTe<sub>2</sub>.</p>

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Connection between f-electron correlations and magnetic excitations in UTe2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月4日

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  • 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

摘要

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 \(\hat{b}\) b ̂ -axis. In applied magnetic fields to at least μ0H = 11 T along the \(\hat{c}-{\rm{axis}}\) c ̂ − 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 \(\hat{a}\) a ̂ -axis, and a fluctuating magnetic moment of μeff=1.7(5) μB. We propose interband spin excitons arising from f-electron hybridization as a possible origin of the magnetic excitations in UTe2.