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<p>Materials in the family <i>R</i>V<sub>6</sub>Sn<sub>6</sub> (<i>R</i> = rare earth) provide a unique platform to investigate the interplay between local moments from <i>R</i> layers and nonmagnetic vanadium kagome layers. Yet, the investigation of actinide members remains scarce. Here we report the synthesis of UV<sub>6</sub>Sn<sub>6</sub> single crystals through the self-flux technique. Physical property measurements reveal two uranium-driven antiferromagnetic transitions at <i>T</i><sub><i>N</i>1</sub> = 29 K and <i>T</i><sub><i>N</i>2</sub> = 24 K, a complex field-temperature phase diagram, and unusual negative domain-wall magnetoresistance. Specific heat and angle-resolved photoemission spectroscopy measurements show a moderate <i>f</i>-electron enhancement to the density of states at the Fermi level (<i>E</i><sub><i>F</i></sub>), whereas our band structure calculations place the vanadium flat bands 0.25 eV above <i>E</i><sub><i>F</i></sub>. These findings point to a materials opportunity to expand the uranium 166 family with the goal of enhancing correlations by tuning 5<i>f</i> and 3<i>d</i> flat bands to <i>E</i><sub><i>F</i></sub>.</p>

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Unusual 5f magnetism in new kagome material UV6Sn6

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • S. M. Thomas,
  • C. S. Kengle,
  • W. Simeth,
  • Chan-young Lim,
  • Z. W. Riedel,
  • K. Allen,
  • A. Schmidt,
  • M. Ruf,
  • Seonggeon Gim,
  • J. D. Thompson,
  • F. Ronning,
  • A. O. Scheie,
  • C. Lane,
  • J. D. Denlinger,
  • S. Blanco-Canosa,
  • Jian-Xin Zhu,
  • E. D. Bauer,
  • P. F. S. Rosa

摘要

Materials in the family RV6Sn6 (R = rare earth) provide a unique platform to investigate the interplay between local moments from R layers and nonmagnetic vanadium kagome layers. Yet, the investigation of actinide members remains scarce. Here we report the synthesis of UV6Sn6 single crystals through the self-flux technique. Physical property measurements reveal two uranium-driven antiferromagnetic transitions at TN1 = 29 K and TN2 = 24 K, a complex field-temperature phase diagram, and unusual negative domain-wall magnetoresistance. Specific heat and angle-resolved photoemission spectroscopy measurements show a moderate f-electron enhancement to the density of states at the Fermi level (EF), whereas our band structure calculations place the vanadium flat bands 0.25 eV above EF. These findings point to a materials opportunity to expand the uranium 166 family with the goal of enhancing correlations by tuning 5f and 3d flat bands to EF.