Physical properties of new delafossite triangular-lattice compounds TlErSe$_2$ and TlTmSe$_2$
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arXiv
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| Natura: | Preprint |
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2025
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| author | Rubrecht, Bastian Häußler, Ellen Pillaca, Mirtha Bhattacharyya, Pritam Hozoi, Liviu Nosenko, Artem Efremov, Dmitri V. Büchner, Bernd Wolter, Anja U. B. Doert, Thomas |
| author_facet | Rubrecht, Bastian Häußler, Ellen Pillaca, Mirtha Bhattacharyya, Pritam Hozoi, Liviu Nosenko, Artem Efremov, Dmitri V. Büchner, Bernd Wolter, Anja U. B. Doert, Thomas |
| contents | Delafossite compounds containing rare-earth ions have been proven to be an ideal platform to investigate frustrated magnetic ground states. Here, we discuss two triangular-lattice antiferromagnets, TlErSe$_2$ and TlTmSe$_2$, as potential candidates for hosting exotic quantum states. Powder X-ray diffraction data analysis of the black-color polycrystalline Tl$RE$Se$_2$ ($RE$: Er and Tm) samples confirms the phase purity. Both materials crystallize in the trigonal $α$-NaFeO$_2$ structure ($R\overline{3}m$) with lattice parameters $a$ = 4.1070(4) Å and $c$ = 23.1472(1) Å for the erbium compound and $a$ = 4.0916(1) Å and $c$ = 23.1483(2) Å for the thulium compound. Magnetic susceptibility measurements show an effective moment of $μ_{\text{eff}} = 9.6(2) μ_B$/f.u. ($7.5(1) μ_B$/f.u.) for TlErSe$_2$ (TlTmSe$_2$) for temperatures above 200 K. While $^3$He specific-heat measurements reveal long-range magnetic order below $T_N = 0.42 $K for TlErSe$_2$, no sign of long-range magnetic order was observed for TlTmSe$_2$. Based on our results, we map out the T-H phase diagram for polycrystalline TlErSe$_2$ and discuss the striking difference in the magnetic behavior of TlTmSe$_2$ based on our ab initio quantum chemical calculations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_11627 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Physical properties of new delafossite triangular-lattice compounds TlErSe$_2$ and TlTmSe$_2$ Rubrecht, Bastian Häußler, Ellen Pillaca, Mirtha Bhattacharyya, Pritam Hozoi, Liviu Nosenko, Artem Efremov, Dmitri V. Büchner, Bernd Wolter, Anja U. B. Doert, Thomas Strongly Correlated Electrons Delafossite compounds containing rare-earth ions have been proven to be an ideal platform to investigate frustrated magnetic ground states. Here, we discuss two triangular-lattice antiferromagnets, TlErSe$_2$ and TlTmSe$_2$, as potential candidates for hosting exotic quantum states. Powder X-ray diffraction data analysis of the black-color polycrystalline Tl$RE$Se$_2$ ($RE$: Er and Tm) samples confirms the phase purity. Both materials crystallize in the trigonal $α$-NaFeO$_2$ structure ($R\overline{3}m$) with lattice parameters $a$ = 4.1070(4) Å and $c$ = 23.1472(1) Å for the erbium compound and $a$ = 4.0916(1) Å and $c$ = 23.1483(2) Å for the thulium compound. Magnetic susceptibility measurements show an effective moment of $μ_{\text{eff}} = 9.6(2) μ_B$/f.u. ($7.5(1) μ_B$/f.u.) for TlErSe$_2$ (TlTmSe$_2$) for temperatures above 200 K. While $^3$He specific-heat measurements reveal long-range magnetic order below $T_N = 0.42 $K for TlErSe$_2$, no sign of long-range magnetic order was observed for TlTmSe$_2$. Based on our results, we map out the T-H phase diagram for polycrystalline TlErSe$_2$ and discuss the striking difference in the magnetic behavior of TlTmSe$_2$ based on our ab initio quantum chemical calculations. |
| title | Physical properties of new delafossite triangular-lattice compounds TlErSe$_2$ and TlTmSe$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.11627 |