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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.13245 |
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| _version_ | 1866909539654172672 |
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| author | Thomas, S. M. Kengle, C. S. Simeth, W. Lim, Chan-young Riedel, Z. W. Allen, K. Schmidt, A. Ruf, M. Gim, Seonggeon Thompson, J. D. Ronning, F. Scheie, A. O. Lane, C. Denlinger, J. D. Blanco-Canosa, S. Zhu, Jian-Xin Bauer, E. D. Rosa, P. F. S. |
| author_facet | Thomas, S. M. Kengle, C. S. Simeth, W. Lim, Chan-young Riedel, Z. W. Allen, K. Schmidt, A. Ruf, M. Gim, Seonggeon Thompson, J. D. Ronning, F. Scheie, A. O. Lane, C. Denlinger, J. D. Blanco-Canosa, S. Zhu, Jian-Xin Bauer, E. D. Rosa, P. F. S. |
| contents | Materials in the family $R$V$_{6}$Sn$_{6}$ ($R=$ 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 UV$_{6}$Sn$_{6}$ single crystals through the self-flux technique. Magnetic susceptibility, specific heat, electrical resistivity, and thermal expansion measurements reveal two uranium-driven antiferromagnetic transitions at $T_{N1}=29$~K and $T_{N2}=24$~K, a complex field-temperature phase diagram, and unusual negative domain wall magnetoresistance. Specific heat measurements unveil a modest Sommerfeld coefficient of $γ= 40$~mJ/mol.K$^{2}$, consistent with angle-resolved photoemission spectroscopy measurements that show a moderate $f$-electron enhancement at the Fermi level ($E_{F}$). Our experiments support a modest contribution from \textit{5f} flat bands to the density of states at $E_{F}$, whereas our band structure calculations place the vanadium flat bands 0.25~eV above $E_{F}$. Our 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 $E_{F}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_13245 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | UV$_6$Sn$_6$: a new kagome material with unusual $5f$ magnetism Thomas, S. M. Kengle, C. S. Simeth, W. Lim, Chan-young Riedel, Z. W. Allen, K. Schmidt, A. Ruf, M. Gim, Seonggeon Thompson, J. D. Ronning, F. Scheie, A. O. Lane, C. Denlinger, J. D. Blanco-Canosa, S. Zhu, Jian-Xin Bauer, E. D. Rosa, P. F. S. Strongly Correlated Electrons Materials Science Materials in the family $R$V$_{6}$Sn$_{6}$ ($R=$ 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 UV$_{6}$Sn$_{6}$ single crystals through the self-flux technique. Magnetic susceptibility, specific heat, electrical resistivity, and thermal expansion measurements reveal two uranium-driven antiferromagnetic transitions at $T_{N1}=29$~K and $T_{N2}=24$~K, a complex field-temperature phase diagram, and unusual negative domain wall magnetoresistance. Specific heat measurements unveil a modest Sommerfeld coefficient of $γ= 40$~mJ/mol.K$^{2}$, consistent with angle-resolved photoemission spectroscopy measurements that show a moderate $f$-electron enhancement at the Fermi level ($E_{F}$). Our experiments support a modest contribution from \textit{5f} flat bands to the density of states at $E_{F}$, whereas our band structure calculations place the vanadium flat bands 0.25~eV above $E_{F}$. Our 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 $E_{F}$. |
| title | UV$_6$Sn$_6$: a new kagome material with unusual $5f$ magnetism |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2503.13245 |