Synthesis and Anisotropic Magnetic Properties of LiCrTe$_2$ Single Crystals with a Triangular-Lattice Antiferromagnetic Structure
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| Format: | Preprint |
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2023
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| _version_ | 1866917952404586496 |
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| author | Witteveen, Catherine Nocerino, Elisabetta López-Paz, Sara A. Jeschke, Harald O. Pomjakushin, Vladimir Y. Månsson, Martin von Rohr, Fabian O. |
| author_facet | Witteveen, Catherine Nocerino, Elisabetta López-Paz, Sara A. Jeschke, Harald O. Pomjakushin, Vladimir Y. Månsson, Martin von Rohr, Fabian O. |
| contents | We report on the synthesis of LiCrTe$_2$ single crystals and on their anisotropic magnetic properties. We have obtained these single crystals by employing a Te/Li-flux synthesis method. We find LiCrTe$_2$ to crystallize in a TlCdS$_2$ -type structure with cell parameters of $a$ = 3.9512(5) Å and $c$ = 6.6196(7) Å at $T$ = 175 K. The content of lithium in these crystals was determined to be near stoichiometric by means of neutron diffraction. We find a pronounced magnetic transition at $T^{\rm ab}_{\rm N}$ = 144 K and $T^{\rm c}_{\rm N}$ = 148 K, respectively. These transition temperatures are substantially higher than earlier reports on polycrystalline samples. We have performed neutron powder diffraction measurements that reveal that the long-range low-temperature magnetic structure of single crystalline LiCrTe$_2$ is an A-type antiferromagnetic (AFM) structure. Our DFT calculations are in good agreement with these experimental observations. We find the system to be easy axis with moments oriented along the $c$-direction experimentally as well as in our calculations. Thereby, the magnetic Hamiltonian can be written as $H = H_{\rm Heisenberg} + \sum_i K_c (S_i^z)^2$ with $K_c=-0.34K$ (where $|S^z|=\frac{3}{2}$). We find LiCrTe$_2$ to be highly anisotropic, with a pronounced metamagnetic transition for $H \perp ab$ with a critical field of $μH_{MM}$(5 K) $\approx$ 2.5 T. Using detailed orientation-dependent magnetization measurements, we have determined the magnetic phase diagram of this material. Our findings suggest that LiCrTe$_2$ is a promising material for exploring the interplay between crystal structure and magnetism, and could have potential applications in spin-based 2D devices. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2304_01767 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Synthesis and Anisotropic Magnetic Properties of LiCrTe$_2$ Single Crystals with a Triangular-Lattice Antiferromagnetic Structure Witteveen, Catherine Nocerino, Elisabetta López-Paz, Sara A. Jeschke, Harald O. Pomjakushin, Vladimir Y. Månsson, Martin von Rohr, Fabian O. Materials Science We report on the synthesis of LiCrTe$_2$ single crystals and on their anisotropic magnetic properties. We have obtained these single crystals by employing a Te/Li-flux synthesis method. We find LiCrTe$_2$ to crystallize in a TlCdS$_2$ -type structure with cell parameters of $a$ = 3.9512(5) Å and $c$ = 6.6196(7) Å at $T$ = 175 K. The content of lithium in these crystals was determined to be near stoichiometric by means of neutron diffraction. We find a pronounced magnetic transition at $T^{\rm ab}_{\rm N}$ = 144 K and $T^{\rm c}_{\rm N}$ = 148 K, respectively. These transition temperatures are substantially higher than earlier reports on polycrystalline samples. We have performed neutron powder diffraction measurements that reveal that the long-range low-temperature magnetic structure of single crystalline LiCrTe$_2$ is an A-type antiferromagnetic (AFM) structure. Our DFT calculations are in good agreement with these experimental observations. We find the system to be easy axis with moments oriented along the $c$-direction experimentally as well as in our calculations. Thereby, the magnetic Hamiltonian can be written as $H = H_{\rm Heisenberg} + \sum_i K_c (S_i^z)^2$ with $K_c=-0.34K$ (where $|S^z|=\frac{3}{2}$). We find LiCrTe$_2$ to be highly anisotropic, with a pronounced metamagnetic transition for $H \perp ab$ with a critical field of $μH_{MM}$(5 K) $\approx$ 2.5 T. Using detailed orientation-dependent magnetization measurements, we have determined the magnetic phase diagram of this material. Our findings suggest that LiCrTe$_2$ is a promising material for exploring the interplay between crystal structure and magnetism, and could have potential applications in spin-based 2D devices. |
| title | Synthesis and Anisotropic Magnetic Properties of LiCrTe$_2$ Single Crystals with a Triangular-Lattice Antiferromagnetic Structure |
| topic | Materials Science |
| url | https://arxiv.org/abs/2304.01767 |