Magnetic order and physical properties of the Kagome metal UNb$_6$Sn$_6$
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866913983928205312 |
|---|---|
| author | Riedel, Z. W. Simeth, W. Kengle, C. S. Thomas, S. M. Thompson, J. D. Scheie, A. O. Ronning, F. Lane, C. Zhu, Jian-Xin Rosa, P. F. S. Bauer, E. D. |
| author_facet | Riedel, Z. W. Simeth, W. Kengle, C. S. Thomas, S. M. Thompson, J. D. Scheie, A. O. Ronning, F. Lane, C. Zhu, Jian-Xin Rosa, P. F. S. Bauer, E. D. |
| contents | The $RM_6X_6$ family of materials ($R$ = rare-earth, $M$ = transition metal, $X$ = Ga, Si, Ge, Sn) produces an array of emergent phenomena, such as charge density waves, intrinsic Hall effects, and complex magnetic order, due to its Kagome net of transition metal atoms, its local-moment magnetic anisotropies, and its extensive chemical tunability. Here, we report a new ``166" material containing both an actinide (uranium) and a 4$d$ transition metal (niobium) to investigate the properties of a 5$f$-4$d$ electron 166 system. UNb$_6$Sn$_6$ crystallizes in the hexagonal $P$6/$mmm$ space group with a small degree of disorder due to shifts in the size of the CoSn-like cages along the $c$ axis. Upon cooling at zero magnetic field, the material undergoes two magnetic phase transitions at $T_\mathrm{2}$ = 46 K and $T_\mathrm{N}$ = 43 K. The low-temperature, zero-field phase is an antiferromagnet with ordered uranium moments and a $\textbf{k}$=(0,0,1/2) propagation vector determined by neutron diffraction. Remarkably, with a magnetic field applied along the $c$ axis, five additional magnetic transitions occur, evidenced by magnetization and resistivity data, before the moment saturates at 2.62 $μ_{\mathrm{B}}$/U at 2 K and $\ge$13.6 T. In two magnetic phase regions, the Hall resistivity of UNb$_6$Sn$_6$ significantly deviates from the magnetization, suggesting that the phases have a large Berry curvature or a change in the Fermi surface. The unknown magnetic ordering of the field-dependent phases of UNb$_6$Sn$_6$ demonstrates the complexity of the 5$f$-4$d$ 166 system and encourages further study of its properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_08913 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnetic order and physical properties of the Kagome metal UNb$_6$Sn$_6$ Riedel, Z. W. Simeth, W. Kengle, C. S. Thomas, S. M. Thompson, J. D. Scheie, A. O. Ronning, F. Lane, C. Zhu, Jian-Xin Rosa, P. F. S. Bauer, E. D. Strongly Correlated Electrons Materials Science The $RM_6X_6$ family of materials ($R$ = rare-earth, $M$ = transition metal, $X$ = Ga, Si, Ge, Sn) produces an array of emergent phenomena, such as charge density waves, intrinsic Hall effects, and complex magnetic order, due to its Kagome net of transition metal atoms, its local-moment magnetic anisotropies, and its extensive chemical tunability. Here, we report a new ``166" material containing both an actinide (uranium) and a 4$d$ transition metal (niobium) to investigate the properties of a 5$f$-4$d$ electron 166 system. UNb$_6$Sn$_6$ crystallizes in the hexagonal $P$6/$mmm$ space group with a small degree of disorder due to shifts in the size of the CoSn-like cages along the $c$ axis. Upon cooling at zero magnetic field, the material undergoes two magnetic phase transitions at $T_\mathrm{2}$ = 46 K and $T_\mathrm{N}$ = 43 K. The low-temperature, zero-field phase is an antiferromagnet with ordered uranium moments and a $\textbf{k}$=(0,0,1/2) propagation vector determined by neutron diffraction. Remarkably, with a magnetic field applied along the $c$ axis, five additional magnetic transitions occur, evidenced by magnetization and resistivity data, before the moment saturates at 2.62 $μ_{\mathrm{B}}$/U at 2 K and $\ge$13.6 T. In two magnetic phase regions, the Hall resistivity of UNb$_6$Sn$_6$ significantly deviates from the magnetization, suggesting that the phases have a large Berry curvature or a change in the Fermi surface. The unknown magnetic ordering of the field-dependent phases of UNb$_6$Sn$_6$ demonstrates the complexity of the 5$f$-4$d$ 166 system and encourages further study of its properties. |
| title | Magnetic order and physical properties of the Kagome metal UNb$_6$Sn$_6$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2504.08913 |