A molecular diamond lattice antiferromagnet as a Dirac semimetal candidate
| Autor: | Shimizu, Yasuhiro, Otsuka, Akihiro, Maesato, Mitsuhiko, Tsuchiizu, Masahisa, Nakao, Akiko, Yamochi, Hideki, Hiramatsu, Takaaki, Yoshida, Yukihiro, Saito, Gunzi |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 99, 174417 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.99.174417 |
| Popis: | The ground state of a molecular diamond-lattice compound (ET)Ag$_4$(CN)$_5$ is investigated by the magnetization and nuclear magnetic resonance spectroscopy. We found that the system exhibits antiferromagnetic long-range ordering with weak ferromagnetism at a high temperature of 102 K owing to the strong electron correlation. The spin susceptibility is well fitted into the diamond-lattice Heisenberg model with a nearest neighbor exchange coupling of 230 K, indicating the less frustrated interactions. The transition temperature elevates up to $\sim$195 K by applying pressure of 2 GPa, which records the highest temperature among organic molecular magnets. The first-principles band calculation suggests that the system is accessible to a three-dimensional topological semimetal with nodal Dirac lines, which has been extensively searched for a half-filling diamond lattice. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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